GPC Latency Problems and audio dropouts/distortion

I have spent three days trying to find definitive solutions to the audio dropout/distortion problems with this Pavilion dv7 - 1245dx Notebook running Vista sp2 x64. Having taken all the suggestions by Daniel P in the forums, including updating all drivers, running the DPC Latency Checker and disabling all the relevant drivers, firewalls, etc., I have come to the conclusion that HP has simply manufactured a poorly designed product, replete with mediocre software like the Atheros WLAN drivers, the IDT SRS audio chip drivers and the RealTek Ethernet drivers. While the latency spikes can be vitiated somewhat, they cannot be eliminated entirely. Perhaps the AMD Turion x2 processor is inferior, since my son also own a Pavilion dv7T-4000 with an Intel Core 2 chip, with the usual bucket of HP bundled crap, and there is absolutly no sign of yellow or red spikes. I even tried running the Microsoft RRATV3 to try to identify the offending drivers, but the program will not run in 64-bit mode.
One word on HP technical assistance: once an HP product is out-of-warranty (usually one year), they've never heard of you. They hand you off to some third-party contracted service that wants to dip into your pocket to extricate $100 for their troubleshooting advice. This seems to me to be highly excessive, especially for a poorly designed machine, and most customers thus burned (as revealed in Forum comments) have expressed the desire to make their next computer purchases elsewhere. I have noticed that this audio dropout problem is listed by owners as far back as 2006. It is unconscionable that the problem still persists with HP computers, and I have also observed that many, if not most, of the queries have not received a single reply. If this is so, then what is the use? Why should a person with the same problem, who posted in 2009, not have the courtesy of a reply by 2013? This is absurd! Under these circcumstances, it is hard to recommend HP products/services to anyone.

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Similar Messages

Another problem with audio dropouts in PrE 10

G'day All,
Earlier this year I had a problem with Premiere Elements where audio files from AVC HD clips dragged in from my camcorder were dropping out.
http://forums.adobe.com/message/4267924#4267924
Bill Hunt was able to help me out at the time by confirming that the files weren't conforming - boom boom! That is, all the clips I wanted had been dropped in, but the conforming of the videos had not completed, because I never noticed the little blue progress bar lower-right.
As advised, I tracked down the dodgy PEK and CFA files that had been created incomplete, deleted them, dropped the clips back in to the project, went and made a cup of tea until the blue progress bar stopped running, and the problem was solved.
Now it's back. Not only that, but I cannot find any PEK or CFA files relevant to the project where the problem is occuring. A search yields no results for such files on my hard-drive for today!
(I also note that all such files now seem to have shifted to being stored elsewhere on the harddrive, and not in the originally nominated 'scratchpad' where they were stored during the first round of difficulty.)
I deleted all files and folders I could find that were created today associated with the project the problem occured in, and the project istelf, rebooted, created a new project, and dragged the original videos into it. No conforming occurred! Sound dropouts are identical. Somewhere on my system it would appear that some faulty conforming record relating to these files has been created, but I have no idea where it is, or why it no longer appears to be stored as a CFA of PEK file.
Any ideas? It's doing my head in!
regards,
Bill

Hello JJVANKA,
it might be that the %%pluginname%% plugin is possibly outdated. Could you please check the following:
#Go to [http://www.mozilla.com/en-US/plugincheck/ the Mozilla plugin check site]
#Wait for the plugin check to complete.
#If any plugin is outdated, go to the Website of the plugin to download a recent version!
Kind regards,
Tobbi
Firefox Support Volunteer

[SOLVED] USB sound card problems and audio setup

I want to clarify and correctly set up my ThinkPad T61 sound system finally.
I'm running Arch64 + KDE.
There are two sound cards - the internal HDA Intel and external USB CM118.
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Set [C-Media USB Headphone Set], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 1: Intel [HDA Intel], device 1: AD198x Digital [AD198x Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
First of all, why are there both analog and digital subdevices?
I just need playback and/or recording support for these applications: opera, firefox, skype, clementine, mplayer, vmplayer. As high quality as possible.
Per-application sound control would be nice but if that adds too much clutter, I could live without it. No need for audio streaming or any other luxuries.
All the applications should use the USB card whenever it's plugged in. The internal SC should take over when CM118 is unplugged.
The problem is that most of the time it doesn't work. For example, if I plug out the USB card and then run some application like Clementine or Firefox there would be no sound ("connection refused" in Clementine).
Here is my asound.conf:
defaults.pcm.card 0
defaults.pcm.device 0
defaults.ctl.card 0
Also kMix/amix should switch the master channel from HDA Intel Master to C-Media Master automatically. The only way to do this is to write some kind of script, right?
AFAIK the following audio components are installed: ALSA, OSS (for some unknown reason), Phonon, Gstreamer.
I guess I can uninstall OSS without worries as no one seems to need it (checked with "whoneeds").
What about that Phonon? Would it override the asoud.conf if I set default device there? Why there are so many different devices in the Phonon configuration list:
C-Media USB Headphone Set, USB Audio (Default Audio Device)
C-Media USB Headphone Set (USB Audio)
C-Media USB Headphone Set, USB Audio (IECblablabla)
hw:1,0
hw:1,1
default
Intel Analog
Intel Digital
blablalba
And that C-Media triplet for every USB port the CM118 has been plugged in.
Too much confusion! All that mess for just two different cards.
So what is the proper way of setting primary and secondary sound cards in this situation?
Thank you!
Last edited by andrisll (2012-07-19 08:48:28)

I am sorry for my very late response and the lack of structure in my post.
I did some investigation and found a rather acceptable workaround for one of my problems described below.
Here is the basic functionality I need:
1. Automatic (on the fly) switching to the external sound card when it's plugged in and automatic fallback to the integrated SC when usb is unplugged.
2. Automatic (on the fly) switching of the kMix's master channel according to the changes mentioned above.
As for the first problem, I found this udev rule:
KERNEL=="pcmC[D0-9cp]*", ACTION=="add", PROGRAM="/bin/sh -c 'K=%k; K=$${K#pcmC}; K=$${K%%D*}; echo defaults.ctl.card $$K > /etc/asound.conf; echo defaults.pcm.card $$K >>/etc/asound.conf"
KERNEL=="pcmC[D0-9cp]*", ACTION=="remove", PROGRAM="/bin/sh -c 'echo defaults.ctl.card 0 > /etc/asound.conf; echo defaults.pcm.card 0 >>/etc/asound.conf'"
This solution has some disadvantages but it is acceptible. If you know of any better solution, please tell me.
For the second problem, I found this script which uses qdbus org.kde.kmix /Mixers org.kde.KMix.MixSet.setCurrentMaster method to set the master channel. However, I think that constant monitoring for the usb SC being plugged is not very effective. So I thought appending the following code to the second line of the previous udev rule would do the work:
, RUN+="/usr/bin/qdbus org.kde.kmix /Mixers org.kde.KMix.MixSet.setCurrentMaster "ALSA::C-Media_USB_Headphone_Set:1" "Speaker:0""
But that results in some weird behaviour: master channel stays the same but there would be three new tabs in the kMix window now: USB Set", USB Set# and USB Set$.
Here's what log messages tell us:
07/14/12 12:25:13 PM localhost kernel [10889.749048] usb 3-1: new full-speed USB device number 13 using uhci_hcd
07/14/12 12:25:14 PM localhost kernel [10889.914921] input: C-Media USB Headphone Set as /devices/pci0000:00/0000:00:1a.1/usb3/3-1/3-1:1.3/input/input21
07/14/12 12:25:14 PM localhost kernel [10889.915454] generic-usb 0003:0D8C:000C.000C: input,hidraw0: USB HID v1.00 Device [C-Media USB Headphone Set ] on usb-0000:00:1a.1-1/input3
07/14/12 12:25:14 PM localhost mtp-probe checking bus 3, device 13: "/sys/devices/pci0000:00/0000:00:1a.1/usb3/3-1"
07/14/12 12:25:14 PM localhost mtp-probe checking bus 3, device 13: "/sys/devices/pci0000:00/0000:00:1a.1/usb3/3-1"
07/14/12 12:25:14 PM localhost mtp-probe checking bus 3, device 13: "/sys/devices/pci0000:00/0000:00:1a.1/usb3/3-1"
07/14/12 12:25:14 PM localhost mtp-probe checking bus 3, device 13: "/sys/devices/pci0000:00/0000:00:1a.1/usb3/3-1"
07/14/12 12:25:14 PM localhost mtp-probe bus: 3, device: 13 was not an MTP device
07/14/12 12:25:14 PM localhost mtp-probe bus: 3, device: 13 was not an MTP device
07/14/12 12:25:14 PM localhost mtp-probe bus: 3, device: 13 was not an MTP device
07/14/12 12:25:14 PM localhost mtp-probe bus: 3, device: 13 was not an MTP device
You see, the probe thing is running multiple times!
And here is an excerpt from udev debugger:
starting '/usr/bin/qdbus org.kde.kmix /Mixers org.kde.KMix.MixSet.setCurrentMaster '
'/usr/bin/qdbus org.kde.kmix /Mixers org.kde.KMix.MixSet.setCurrentMaster '(err) 'Could not connect to D-Bus server: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11'
'/usr/bin/qdbus org.kde.kmix /Mixers org.kde.KMix.MixSet.setCurrentMaster ' [2769] exit with return code 1
'/usr/bin/qdbus org.kde.kmix /Mixers org.kde.KMix.MixSet.setCurrentMaster '(err) 'Could not connect to D-Bus server: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11'
Some kind of X11 problem... And also happening twice! Why?
Running the setCurrentMaster method in terminal works very nicely, so the problem must be the way udev runs it.
One last thing - sometimes the usb SC automatically reconnects (disconnects and connects). I read somewhere that most probably the usb device makes the trouble, but maybe there are other possiblities?
Last edited by andrisll (2012-07-14 10:04:16)

MOVED: Latency problem and potentialy linked Vista problem with K9VGM-V

This topic has been moved to Vista problems.
https://forum-en.msi.com/index.php?topic=107394.0

Like you already mentioned: you are using some beta-drivers which may cause some trouble.
Please verify that you installed the driversin the propper order: chipset drivers first (VIA-drivers that is, you can have a look at VIA's website to see if there are any VIA Drivers for Vista you can use. Install VGA drivers after that and the SB drivers last.
Just a tip: I recommend you have a look at your power supply unig. A 350W PSU with your hardware probably is not enough to run your system on. It even may cause your system to act strangely, like you just described.
How many amps on 12V rail?

External display at 1920x1200 causing audio dropouts

I've got my Macbook hooked up to a Samsung Syncmaster 245B+ 24" monitor running at 1920x1200 with the Macbook in clamshell mode, I bought the monitor a couple of weeks ago and ever since I've been having problems with audio dropouts, both with the onboard soundcard and my external Presonus Firefox Firewire audio interface.
It seems the CPU is being overloaded at random, usually when there is some kind of graphical happening in a web browser for example. If I load up a page with a lot of graphical elements on it, sometimes the audio cuts out for a few seconds and then comes back, even then it can come back distorted. I can usually force these dropouts by briskly resizing the browser window, which makes the CPU usage level increase somewhat and thus the audio cuts out.
I first of all put this down to the Macbook not being able to display at this resolution sufficiently, but I have seen no other complaints from people running a 24" external. What's even more concerning is that I can switch the external down to lower resolutions (ie 1024x640) and still get the audio dropouts, which should not be happening as the Macbooks own display runs higher than this and I never get a problem when using it that way.
I've tried creating a new user account and the problem persists. Tried repairing disk permissions (although I knew it would make no difference) to no avail. I suppose the next step would be a complete reinstall of Leopard, but obviously would like to avoid this.
Does anyone have any suggestions as to what the problem could be? Do you think it's just the Macbook in general not being able to handle this monitor or a specific problem with mine?
I hope I can get this sorted, it's really off putting having music dropouts while I am working...
TIA,
Alex

Next time is happens, try unplugging the external monitor, but only the external monitor. Leave everything else plugged in, including any peripherals, like the Personus and also any attached USB devices. If the problem persists, then start unplugging the peripherals one-by-one.
Generally a display should have no bearing on sound since the GPU (X3100) is completely separate from the CPU where sound is managed.
You haven't said anything about your MacBook's configuration but maybe there is an insufficient amount of RAM for the number of processes running. That's another possibility.

IPod Touch 2nd gen. audio dropouts

I just received my 2nd gen 8GB touch. Transferred one album to it for testing. The sound every now and then drops out for a split second. Never in the same spot in music though- so it's not a bad rip or faulty transfer. The dropouts also occur when listening to Pandora. I did a complete restore- and it didn't help. Turned off WiFi, no better.
Is this a known problem or is it unique to my iPod?
Any known solutions?
Thanks.

I have the same problem with audio dropouts with the Gen 2 32GB iPod Touch running Apple lossless, yet I never had this problem with Apple Gen 1 16GB iPod Touch running Apple lossless. This is a serious quality control issue and reflects lack of beta-testing. I have toyed with the idea of jumping into the Apple laptop world (from the PC world), but not now. I think this company has become marketing hype and does not care about quality control or perfection of a product. Lastly, I realy believe the audio quality is not on par with the Gen 1 iPod Touch (Klipsh IMAGE Headphones)-another suggestion of quality reduction to pay for marketing.

Thinkpad Edge E440 Random Lags, Stuttering, Latency Problem.

Dear All, I bought Thinkpad Edge E440 almost two weeks ago. The problem is it randomly lags and stutter without reason. For example I was writing documents on Microsoft Word, plays music on foobar2000 and doing some light browsing (only few tabs) but randomly the music lags for 1-2 seconds. It doesn't skip, it lags or stutter (sorry I don't know the right term). Also sometime it took awhile to open a new tab on firefox web browser while usually it took instantly.
Another example is I play two online games, World of Tanks (WoT in short, a tank simulation game) and Ghost Recon Phantoms (a shooting game). When I play both game, the gameplay went smooth but randomly it lags or stutter like 1 second on more, then it went smooth again and then stutter again. The game doesn't became slow (which is called FPS drop if I am not wrong), the display just stop moving and mouse/keyboard become unresponsive during the lag/stutter period. On the other hand I also played WoT on my Pentium 4 PC and it went smooth without any lags, though of course the settings is inferior to my E440 laptop (Ghost Recon Phantoms can't be played on my Pentium 4 so I won't compare it).
Also sometimes the audio sounds 'spiky'.
As I searched online, people said that this is called/related to Latency problem and I should use LatencyMon to check it. After using LatencyMon I found several 'culprits' which causes big latency such as NDIS.sys, ACPI.sys, ATAPORT.sys, storport.sys, etc. I also tried to disable cpu throttling, power management settings and such but the problem doesn't go away.
I am sure that there is something wrong with my hardware because if its caused by settings such as cpu throttling, power management (which I think is software-related) then won't this happen to everybody? I mean, I asked a fellow E440 user and he said that his laptop is fine and my problems doesn't occur on him.
I have phoned Lenovo Customer Service. I was using Windows 7 Ultimate. At first they told me to do clean reinstall and install the drivers in the order the CS give me. I did clean reinstall 4 times to try different driver and program installation sequence to see if I might find a way to fix my problem, but I found no solution (I tried Lenovo CS driver install order on the last clean reinstall). I even tried running LatencyMon after clean reinstall before installing any drivers or updates but the LatencyMon still reports big, 'unhealthy' latency.
Lenovo CS then told me to do hardware scan on Lenovo Solution Center. There are warning on the Nvidia GT740M stress test but the CS told me that the results are good. His last solution is that I should go to a Lenovo Service Center to check for the problem there.
I moved to Windows 8.1 to see if the problem will be solved but too bad it's not. I have ran hardware scan for 5 times, there are two times(or 3 times I forgot) that there is warning on Harddisk SMART short self-test, 2 times warning on Nvidia GT740M stress test, one time scan finished with no warning. Even so, the end result for all the tests is 'Passed'.
I think the problem lies within my harddisk (or something related to data transfer) since when I browse my local drive in windows explorer sometimes it took a long time for the icons to load but sometime it just loads instantly. And I am not sure what that Nvidia stress test warning has to do with.
Also I only use the stock 4GB Ram. Could this related to the problem? Though when I look at Windows 8.1 Task Manager the memory usage rarely goes above 60%.
Last but not least. I plug a wireless mouse on my laptop which I use mostly for playing games, but in the end I switches between mouse-touchpad-mouse and so on during working too. Sometime my touchpad suddenly went unresponsive for few seconds but my mouse is still usable during that moment. Then after I move my wireless mouse, my touchpad become responsive again. Any idea why this is happening? I think this is probably because touchpad driver not perfectly compatible with Windows 8.1 as I don't recall having this trackpad issue on WIndows 7.
Can somebody help me? Does anyone else ever had the same problem as I do?
I am sorry for the really long explanation. Your response will be greatly appreciated.
Thank you.
-Tahta

Hi All, sorry for being a while for a long time.
First of all, I should say that I am not sure if my trackpad/pointing device problem is related to the lag/stutter/latency problem so I should have made two different thread instead. Sorry if anyone got confused with this.
@rallygion, the first OS I used on this laptop was Windows 7 64bit. If I remember correctly I don't experience the trackpad/pointing device problem back then, maybe I was just forgotten tho. I am using Windows 8.1 starting sometime before I made this thread. Now the problem has gone worse, sometime the touchpad & red dot in the keyboard won't work for a whole day so I must use external mouse.
At first I thought its compability problem with Windows 8.1 but now I think the hardware has problem too. However, the keyboard is fully functional.
@waqs, thanks for your suggestion! Unfortunately it doesn't solve the lag/stutter/latency problem.
@ghasan, our problem is quite similar except I didn't use the M.2 SSD. One thing I notice is the disk activity sometimes jumps to 100% when the lags happened.
The problem doesn't lie with the laptop specification is inferior. Fyi, when I play music on foobar2000 it took few second for music to start playing (foobar says 'starting playback..') while on my pentium 4 desktop (which I still use) the music plays right after I clicked the song.
Also, eventhough I've closed all my applications, leaving only music player and microsoft word/firefox, the music which is playing lags (randomly stops for a moment).
The lags also happened when watching videos. I played video on Media Player Classic, turned the statistics on. There happen to be frame drops sometimes. Not framerate drop, just frame dropped. I mean, I think framerate dropping has relation with computer power while in my case the frame just randomly drops, which 'damages' the video, not slowing it down.
I am sure that this is hardware-related problem. I am going to take my laptop to service center but not now since I am in need on my laptop now.
I will give update later when I have gone to the service center.

DPC Latency problem

Hi everyone ;)
I'm trying to fix my pc. I'm experiencing DPC Latency problem and it causes audio stuttering. I'm running Windows 8.1 x64. When I'm running LatencyMon, it shows me that some of my drivers give a really high latency.
I was trying to install new drivers, turn off my soundcard (Sound blaster Audigy SE). The problem started to occur, just after a clean install of Windows 8.1, two days ago. Earlier I did not have any problems
with DPC latency. The weird thing is, that I do not have any audio problems when playing games. The problems occur when I'm listening to music or watching movies. Thanks for your help and sorry for my bad english.
PS My computer specs:
Gigabyte GA-G41M-Combo (rev. 1.3)
4 GB DDR3 RAM
Nvidia GeForce 450GTS
Intel Core2Quad 2.5GHz
Creative Sound Blaster Audigy SE
Wireless mouse and keyboard (microsoft ones)
Drivers causing DPC Latency:
ntoskrnl.exe
USBport.sys
dxgkrnl.sys
nvlddmkm.sys
ataport.sys
CLASSPNP.sys
rspLLL64.sys
Thank you for your help!

Hi,
First, please let me know what player you use to listen to music or watch movies? I considered the codec conflict.
If there is any third part player installed, please remove it to check the issue.
If the issue still persists, please upload the .etl file here for further research.
Keep post.
Kate Li
TechNet Community Support

Audio latency problem with VST, SONAR and Audigy 4 PRO

Hello all,
I have a slight problem with audio performance on my computer and I can't isolate what is wrong. I am using Cakewalk SONAR 4 studio edition, and a recently purchased Audigy 4 Pro soundcard. ( I know it's not quite professional grade, but it works well for me) I recently bought some string instruments from the Vienna Symphonic Library. So far, I love the sound of these "virtual instruments" if you will. The problem comes when I try to record them. I get stuttering and dropouts when I try to record the track in Sonar. I've tried the WDM drivers in 16 and 24 bit modes and the ASIO drivers (which apparently only support 16 bit!?) I know Creative has mentioned that these cards can record easily at 24/96 which is what I'd like if possible. Vienna instruments come in a 24 bit format. Is there something I'm doing wrong or do I need to seriously consider a different soundcard? I use Sonar to bring in the Vienna instruments as a VST. I also apply a reverb on it. When I just play this stuff on my MIDI keyboard, it all sounds great and keeps up. The moment I go to record though, I get dropouts after about 15 seconds or so. Also, is there no way to get ASIO 24 bit support for creative's consumer level cards? I'd be happy with the WDM's personally if those would work. I've looked into the KX project as well but haven't had a chance to try their drivers yet. On a different note, what are the significant differences between ASIO and WDM if any at all? (aside from supported bit rates) My current computer setup is quite powerful and I don't use much CPU power at all so I don't think it's my setup. Intel E6700 (2.67Ghz) Core 2 Duo, 2GB DDR2-800, 320GB Seagate SATA in RAID 1, Nvidia 7600GT, and Creative Audigy 4 Pro. Any help, or insight would be greatly appreciated!
Matthew

Audigy 4 Pro should support 24-bit/96 kHz w/ ASIO --> have you selected those I/O drivers in Sonar audio settings (Options-Audio-Drivers -tab). ! You need to unselect all I/O drivers first to get those 24/96 drivers selectable)?
Dropouts comes from various sources. Have you checked if the read/write caching is set properly (Sonar, try different settings)?
Stuttering may come from shared IRQ/resources and PCI Latency settings.
If your graphics card is not PCIe then, make this registry tweak
Run regedit and search the key named as DisableProgPCILatency
- set all 'DisableProgPCILatency' key values to 1 (HEX or DEC) (1 = disabled, 0 = enabled)
- boot to BIOS settings and find the "PCI latency timer" option --> set its value to 32 or 64 (this is global PCI latency setting)
- reboot
and check the IRQ situation. If there are IRQ shares between Audigy and other devices/controllers, try to get those fixed by disabling unneeded controllers/devices or by moving the Audigy into another PCI slot (PCI slots #3 and #4 are normally not shared).
Couple meaninful differences between WDM/KS and ASIO are;
- you can't get latency lower than 10 ms w/ WDM/KS (well, you can in Sonar by manually editing those buffer values but, the result is not good when you go under 10 ms buffer values (buffersize / samplerate * 1000 = latency in ms --> 512/96000*1000=5.33ms)
and
- you can record from one stereo (you can split this to two mono) source at a time w/ WDM (recording source is set in CT Surround Mixer (or windows recording controls))
- ASIO supports (Audigy serie) locked 'resolutions' only - 16/48 or 24/96
Also, tweak your system for music - http://www.musicxp.net/
Some information on CT ASIO -
http://forums.creative.com/creativel...essage.id=1726
jutapa
Message Edited by jutapa on 12-17-200606:01 PM

I am getting audio from the right channel only my iPad and it is distorted with static. How can I resolve this problem?

How do I adjust the audio output of my iPad? There is sound only from the right channel and it is distorted with static.

There is no adjustment as the iPad 2 speaker is on the right side only.

I have bought a new airport express and using it with my macbook (iTunes 10.2.2). I have joined an existing network for internet in my home and with that i am trying to play the music via itunes but there is audio dropouts every 60 secs or so. any soln ?

I have bought a new airport express and using it with my macbook (iTunes 10.2.2). I have joined an existing wireless network for internet in my home and with that i am trying to play the music via itunes but there is audio dropouts every 60 secs or so. I am using a set of speakers from kenwood connected to the airport express. The operating system on my macbook is mac os X 10.5.8. i am sure it is not a problem of streaming music online because i have even tried playing music which are stored in my macbook.
Is there any problem with the setting in itunes or quicktime ? Kindly reply...... I am waiting for your valuable suggestion.
Thank you a lot in advance.

I am shocked to have found this same AX audio dropout problem starting TODAY, every few seconds the audio just drops for a couple seconds and then resumes: Latest software versions of everything. No iPad, iPhone or Touch. Internet hardwired to D-Link DES1105 (1000baseT Switch) hardwired to new 80211N AX, AX optical to stereo, AX Wi-Fi internet to basic 1st-gen MacBook operating at 80211G, and an older 'G' AX extender at the far end of the house, away from all this. The MacBook streaming iTunes is usually 12 feet from AX. I've used this setup for years of trouble-free AirTunes / Airplay until today. Today I also found 2 very reliable fixes and 1 way to force a dropout, but first, I read some posts and tried ALL following settings one-at-a-time and restored them ALL because NONE of them helped: Turned off IPV6. Streamed to multiple speakers 'Computer' and 'AX' (restored to just AX). Turned off 'Ask to Join new (WiFi) Networks'. Turned off Bluetooth (can't live without Magic Trackpad, so glad that wasn't it). Here's my discoveries: Lo and behold, each time I click the Airport icon in the Menu (you know it shows you've got 4 bars from AX) when the status switches to 'Looking for Networks' for a second it CAUSES the AX audio to drop out for a couple seconds (it never did that before today.) iTunes still playing, streaming, AX laser still lit, but the 'PCM' light on stereo and the sound GOES OUT EVERY time I click the Airport icon in the menubar, just like the regular, annoying dropouts. So, to reduce traffic I quit Safari (3 tabs, no streaming, just Gmail, Google, and Netflix browsing). Lo and behold, the dropouts stopped altogether. No other Web apps going (not iTunes Store, Genius, Ping, nothing), so I launched Chrome to the same 3 tabs and the dropouts HAVE NOT RETURNED. That's right, not only did simply QUITTING SAFARI cure it, and Chrome doesn't contribute to it, but I can demonstrate it just by forcing my Airport to re-scan. Works for me, written using Chrome. The other reliable fix is to hardwire MacBook to the Switch. This is obviously not ideal, but Airplay audio doesn't drop out over Ethernet. Also, in all my tests, it made no difference whether iTunes did the streaming, or Airfoil did.

What can be causing inconsistent DVD video and audio distortions...

Does anyone have any idea why the DVD I burn using DVD Studio Pro (from a 90-min FCP QT movie) - whether it’s compressed by DVD Studio Pro, or through Compressor (with bit-rates of 4 for avg., and 7.2 for maximum) - plays with some serious simultaneous video and audio distortions on my brand new DVD player – that don’t show up at all when played on a friend's DVD player.
As a test, I burned a DVD with just the video, and it does NOT play the same distortions on my DVD player. This obviously means the video distortion is related to the audio being there, but, I don’t know why, or how to begin fixing the problem.
Any help would be tremendously appreciated!

Oh yes, indeedy!
Go into the AC3 encode tabs and have a look around. If you never used A.Pack with older versions of DVDSP then none of this will look familiar, but essentially the tabs are exactly the same as the old A.Pack application.
You can set the desired bitrate - for stereo you don't need more than 192Kbps. You can set the dialog normailsation value (for now, type in -31 and press return) and you can set the compression type - just use 'none'.
This should get you a reasonably useable AC3 file for your project, but as you might guess, there is a lot more to it than that! Head over to http:..www,macprovideo.com and see if you can get hold of the tutorials for A.Pack, or find a copy of Martin Sitter's book for DVD Studio Pro (any version). The chapter on A.Pack is well worth reading and possibly justifies the price of the book on its own.
Once you have got the audio encoding sorted out and are using it on a disc, see if the distortion still happens.
Also, can you describe the distortion that you are seeing?

After Install IOS 8 and 8.0.2, the Ipad audio was distorted, and the bluetooth connection to audio speaker have wheezing.

After Install IOS 8 and 8.0.2, the Ipad audio was distorted, and the bluetooth connection to audio speaker have wheezing.

I ALSO just updated my brand new iphone 6 to 8.0.2, and I ALSO had my cellular service BRICKED.
All I get on the signal meter is Verizon 1x. Every so often 3G would popup and you could send a text (no calls though) but it's gone in seconds. So I can't send texts or make phone calls.
This phone worked immediately before the update and stopped working immediately after the update.
My neighbor has a iphone 5S. He updated to 8.0.2 lat week and had no problems UNTIL just this morning, when his phone stopped working - no cellular voice or data. He downgraded back to ios 8.0 but his cellular service never came back.
Called verizon - was told there were no service outages and then I got transferred to tech team.
Tech team had do all the Apple troubleshooting steps but nothing more. So they said "take it back."
So this BRAND NEW iPhone 6 phone is BRICKED because of iOS 8.0.2.
Thanks Apple!

Audio latency problem SOLVED

Hi Everyone, I've recently purchased a Satellite A6665, and found myself having latency problems when using real-time audio processing software such as Ableton Live and/or Nuendo.
Fortunately, I was able to solve the problem installing the ASIO4ALL Drivers.
Here's the link to their website.
http://www.asio4all.com/
I hope you find this useful.
Best regards,
Sebastian.

Hello sebastian, I have the same problem as you with my tecra a11 s3540 and I "solve" it in the same way as you, with asio for all. Any way, I thoung that this problem its saying something about some problem with the usb hubs on our laptops... It will be great if some one could give us any ligth about this... its not normal that a sound card (in this case a focusrite saffire usb 6) only works well using asio for all. I say this becouse I try my sound card on my old laptop (hp dv4000) and its works very nice, no latency problems.
wich sound card do you use?
cheers
Rudolf

MIDI and Audio problems

1. The MIDI problem............the only way to explain this is by an example. I recorded something from my M-audio axiom keyboard, just something simple like a c major scale. Then i saved it reopened it then i played it back it now is a b major scale. If i open the matrix editor its still C but plays back in B and i must transpose it to make it normal. Never have i had this happen before. Has anyone else had this happen? How can i fix it?
Another MIDI problem is sometimes when i play back a MIDI performance it slows down and sounds like slow motion until it stops and says "sample rate 86672 recognized" i am at a loss on this one.
The Audio problem is simply that i get distortion in my recordings but none of my preamps clip. i can even have the gain half of what i would normally set it at, and it sounds distorted.
Any help would be great thanks
Mac Pro Mac OS X (10.4.8)

Possibilities...
There's a (now common) bug that causes bogus data to appear in the Global Transpose track, all by itself, and if the data that got entered was "transpose -1", then your C-major scale will indeed play back in B. To investigate whether this is the cause, open your Global Track display and see if there's any transpose data written in there. If so, delete it and see if that changes the situation for the better.
Another common thing to happen, that's not a Logic bug, is that pitchbend data might get "stuck" at wheel=down. If Logic isn't set up to reset PB (check your MIDI prefs), then the PB data won't be corrected, and will stay "low" util you reset it manually, i.e., flinging the PB wheel/level to reset it to zero. This is probably the best explanation for why Logic will seem to "repair" itself when you reboot/relaunch, because usually upon reboot/relaunch Logic sends out reset messages for things like PB.
As to the sample rate thing, I take it that you're recording at 96K? Or maybe 88.2? If so, you have a clocking problem somewhere.

GPC Latency Problems and audio dropouts/distortion

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