Choppy or Digitized Audio w Time Stretch

Hi Guys,
I've got some audio I've been chopping and time stretching (voiceover to replace a video with poor audio). The VO was recorded in a 96kHz 24bit WAV file, and sounds great when I first played it. However, after I've been chopping (with the blade tool) and timestretching in STP, I'm finding that the audio now sounds digitized or choppy.
Does anyone know what's happening here and what I can do to fix it?
You can get a better idea of my process here. . .
Thanks,
Lawrence
Message was edited by: Lawrence Ingram_Ii

Varispeed only works on the Masterbus, the final output of all tracks. Bouncing the output leaves you a 2-track master.
It's not an easy task because for one, your software tracks are MIDI based, their output is indeed audio but input is MIDI. To use Varispeed you would have to individually bounce each track/take, a mammoth job.
Perhaps someone can help you with Flex which may be you're best bet but is something I don't use very often.

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Hello Everyone.
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In S.P. I use the time scale process to shrink the clip the clip.
I select the audio clip and go to Process>time scale.
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Hi everyone, I am a new user of Logic express, and have found the info on this site extremely helpful, in conjunction with SFlogicninja's tutorials on youtube.
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Lennysapple wrote:
Oh really, it is supposed to be fixed in v 9.1.7
Then I'll have to give it a try.
Hi
Seems to work OK here
Lennysapple wrote:
Did I understand correctly that just by ""renaming"" Logic 9.1.6 inside the application folder it will keep it functioning in case I wanna revert to it later??
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I have mine setup to quickly switch from 32bit to 64 bit (2 copies with different names) and also previous versions.... works fine
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Hello Mr. Wolsky,
I have read many of your extremely well informed posts on this site and greatly respect your opinion. I am wondering, however, if you are perhaps mistaken in stating that one cannot pitch shift in FCP.
I invite you to go to the Apple Sound Effects Plugins folder and take a look at "AUPitch". I have used it often for making Foley sound effects that I either can't be bothered to search out - for instance a huge metal clanging door I pitch shifted up a few octaves and it became a briefcase lock springing open.
I think people just don't look in that folder because it looks kinda boring.
Here is an extract from an article on Ken Stone about the Apple audio filters.
Hope this helps.
Harry.
AUPitch
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rd

I've been using Cubase for years and since I have been doing alot of remix work lately alot of the songs are being sent have been in Logic so I got a copy of Logic Express and I'm able to navigate my way around the basics with no problem. In Cubase SX3 -or CB4 you can time stretch a sample from lets say 124 to 126 bpm. The only thing I see in Logic is the time machine? Is this the way to do what I need to do? I know, I know, read the manual but since I have to work quickly I thought I'd ask here. Any help?
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TIME STRETCH

How is the new timestretch you lucky people, im still waiting for my upgrade.

Matt Mayfield wrote:
In Digital Performer, timestretching is constructive (creates a new audio file), and when you timestretch something multiple times, it always references the ORIGINAL file. That way you avoid adding artifacts on top of artifacts every time.
Does Logic do this yet, and if not, how do you do a similar thing "by hand?"
In logic, sadly this is not yet automated. What you "should" do, is double click on the region you're going to timestrech (which will bring up the sample editor) and then back-up the audio file before performing the stretch.
The actual command is Audiofile -> Backup, but Command-B is the keyboard shortcut so you can just hit that keystroke before you time-stretch - and then you can revert without worry.
Remember that you can also set the number of time stretch undos in logic's preferences.

Poor Results from Time Stretch

Hi all,
So on a number of occasions, I have tried using the Time Stretch feature in Soundtrack Pro, but nearly every time I use it, I get noticeably poor results. For example, if I take a 31-second soundtrack and squeeze it to 30 seconds, the playback sounds very choppy. The same happens vice versa when I stretch audio by small amounts. I find myself having to do this function in Adobe Soundbooth instead. I really like Soundtrack Pro, but it seems that this feature is inferior. The funny thing is, I've seen tutorials online about this feature, but I've never seen the people giving the tutorials have any issues. Does anyone encounter this same issue? And, does anyone know if there's a fix for this situation?
By the way, I'm using Soundtrack Pro 3.0.1, and I'm running it on a Mac-Pro 12-core with Mac OS X 10.6.6.

I've done this all the time and always had good results... And I've been able to stretch quite a bit... My audio has always been 48K, 16 bit.

Time Stretch Problem!

Using Logic pro 9.1.5 I Noticed that when I'm time stretching a track. Once finished, The Level of the track is 3db or more lower than the Original Level !!!! Does anybody know why this happens and if there is anything to do to fix this?

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What you could do, purely as "scientific" exercise, is to create a 30 second audio file, consisting of a constant sinewave at 1 kHz at, let's say, -6 dBfs, and see how that behaves levelwise when stretching it (try both stretching it longer AND shorter ("negative" sretching).
You can use Logics' Test Oscillator insert effect for this, it's in the Utilities section of the plugins.
To me it would make sense that these algorithms are somehow erring on the safe side - the one thing that you wouldn't want is the level to go UP and possibly clip your audio. But again, I don't know, just trying to use logic...

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Hello steviee7. Welcome to the Apple Discussions!
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Time stretching when copying and pasting between projects

I have had 18 separate instrument tracks of a live gig recorded in pro tools, so I simply imported the audio files into logic. I am also using the audio from a video camera to capture the reverb of the hall. The problem is that the audio files are 3 hours long and I would like to mix each song separately. To do this I would like to have a project for each song.
So I have cut the files up into their respective songs, the problem comes when I try and copy the tracks into a new project. The audio files get stretched making the tuning and tempo lower. I have tried copying and pasting as well as dragging the files over to the new project one at a time. I have also checked that the sample rates are the same, which they are.
Does anyone know why logic would be doing this? Are there any fixes you can recommend?
Thanks,
Dave

The sample rates of the files may be the same, while those of the projects may not.
Really, if it's slower and lower, by just about a semitone, then you're definitely playing a 48kHz file in a 44.1kHz project.
Christian

Looking for a time-stretching app

Can you guys recommend your favourite time-stretching app? I'd like to find an easier way of lining up transients to beats, for example.
Thanks,
Shaun

Logic Pro 8 is also the application to use for time-stretching though!
See page 525 *Time Stretching Regions* in the *Logic Pro 8 User Manual*.
shamca wrote:
I know the marquee tool, but I don't see how it can be used to time stretch ?
However, from your original post, now I'm thinking you don't really mean simple time stretching, but you mean doing something more like quantizing audio. Actually, I do use the transient capabilities of the marquee tool to find note beginnings and then move them to a bar location, which actually is a form of audio quantization.
However, Logic also has an audio quantize feature.
Check page 517 of the *Logic Pro 8 User Manual*. I have used this with varying amounts of success.
If you own Ableton Live, it has a better method (IMHO) for quantizing audio by doing something they call "warp markers". With Live, you simply place a warp marker on each transient (note start) that you wish to move, and then move it to the desired bar location. Live then time stretches your audio to match. Because it requires you to select these places, it is more seamless and has less artifacts than the algorithmic method in Logic. Still, if I only need to move a few note beginnings, I prefer to just stay in Logic and do it with the marquee tool.

I recently (Jan 2012) acquired a MacBook Pro (MBP) running 10.7.4 and an AirPort Express. I also have an old PPC G4 tower (Digital Audio model) running 10.4.11. The OS software on both machines is totally up to date. AirPort Utility on the G4 is 5.4.2

I recently (Jan 2012) acquired a MacBook Pro (MBP) running 10.7.4 and an AirPort Express. I also have an old PPC G4 tower (Digital Audio model) running 10.4.11. The OS software on both machines is totally up to date. AirPort Utility on the G4 is 5.4.2 and on 6.0 on the MBP. I bought a used AirPort card for the G4, I believe it is 802.11b compatible, and the wireless data rate is specified at 11 Mbps. Being a newbie to wireless, it took me many days to get these two machines to link up. This network is not connected to the internet, and there no other networks in the vicinity.
My last problem to solve is the very slow file transfer speeds between the two machines. The transfer time seems to vary depending on which machine I use to initiate the transfer, and which direction the transfer is going. For example: If I initiate the transfer from the G4 and send a 5.4MB file to the MBP it takes 1:32 (min:sec), while the same file going from the MBP to the G4 takes 27 seconds. On the other hand if the transfer is initiated on the MBP, going from the MBP to the G4 takes 2:56, while going from the G4 to the MBP takes 1:59. I realize that these times are not actual wireless transfer times but includes the entire transfer process.
Both machines and the AirPort Express are within a 4-foot radius. Both machines are set to radio channel 2. The AirPort Express is set for 802.11n(802.11b/g compatible) with WPA/WPA2 Personal wireless security.
Any help would be appreciated.
CEU2

BDAqua,
Thanks for the response.
Apple has used the term "Digital Audio" to identify this machine. System Profiler has the following information:
Machine Name:          Power Mac G4
Machine Model:          PowerMac3,5
CPU Type:          PowerPC G4 (2.1)
Number Of CPUs:          1
CPU Speed:          800 MHz
L2 Cache (per CPU):          256 KB
Memory:          768 MB
Bus Speed:          133 MHz
Boot ROM Version:          4.3.3f2
Serial Number:          XBxxxxxMK9
Sales Order Number:
Yes, I could connect them by ethernet if all I wanted to do was transfer files, but I would like to network them so I could use wireless internet. The machines are not always so close together, I did that to simplify the testing. With the very slow transfer speeds I am reluctant to move ahead with the internet step.
<Edited By Host>

The Mother of All G4 Digital Audio Project?

Alright, my apologies right from the get-go: I'm new to this user-friendly and intuitive world of Macs. So if this post is long-winded and excessive, please excuse my bad manners and blame it on living in the world of PCs and M$ for far too long.
To start, the one thing I've found that is consistent no matter what computing world I've explored is the cost of upgrading... but first, let me explain a couple of things.
For one -- I'm finished with my PC. I'm fairly computer saavy, and have never bought a pre-built system in my life. My first computer I built in the 8th grade from spare parts and a Pentium 90 chip. Although I've enjoyed my time playing around and working with PCs in the past, I've recently become a father (and my wife is now at home 24/7). Suffice it to say I don't have much time to troubleshoot my PC as often as I use to, and with my wife using the computer more and more, I really would like to be able to offer her something intuitive and easy to use (unfortunately, this usually isn't a common description of anything related to the world of M$ and PCs).
Anyways, her entire extended family has been Mac based for awhile now, and I've grown more and more desirous of owning a Mac at home. Well, about 4 months ago I was given an old G4 Digital Audio for free. This gift, coupled with my increasing frustration with the PC, has lead me to contemplate ditching the PC (selling it off), and trying to fully pimp out the G4 to its maximum capacity. FOR CHEAP.
I realize that a Mac Mini would be pretty cheap and cost effective, or perhaps just selling the G4 and putting that money towards something else (like a Mac laptop) might make more sense... but I'm limited on a couple of fronts.
1) There is the issue of some money having already been invested into this G4.
2) I need to keep costs down, while also retaining the ability to expand (my PC currently has 3 HDDs at a total capacity of 800gb)... and it just doesn't seem feasible with a Mac Mini.
3) I already have the G4 -- and in my wife's eyes, expanding this rig is cheaper than buying a brand new Mac (this point is clearly debatable).
4) We really just need a solid system at home, easy for her to use, while having enough muscle for me to use the Adobe/Macromedia/Final Cut software packages.
So... I'd like to start pushing this G4 to its limits performance wise, while not breaking the bank unnecessarily. I've looked into upgrading the logic board and CPU, maxing out the system memory, purchasing a SATA controller board and new HDDs, and finally springing for a new video card. My question is this:
Can anyone shed some light on upgrade options that would suit my needs, without giving my wife reason to leave me?! For example, when looking to upgrade the G4 to a wireless system, I opted to purchase a Belkin Wireless G (F5D7000) instead of a official Airport card. It works flawlessly, is G compatible, and was only $25. Are there similar options when looking at SATA controller cards (the Sonnet cards are really pricey)? PC133 memory -- should I buy new or look for sticks in older PCs? Buy a pc video card and tweak it to work in a Mac, etc? Should I buy a single cpu upgrade, or spring for the pricey duals (is the performance benefit in OSX and the various design software packages worth it? - I've seen varied reports on this)? 1.6ghz vs. dual 1.4ghz??
Any help in this endeavor to build the Mother of All G4 Digital Audios would be wonderful. I know this post is lengthy, but I needed to vent some frustrations, and ask for a helping hand in this transition from PC to Mac! Thanks to all who've read this beast of a post -- and if anyone has anything to contribute (either suggestions or directions to some relatively cheap upgrades - new or used), it would be greatly appreciated!
Thanks again!

Hi-
I'll keep things brief.
CPU- The following will give you the most bang for the buck-
http://eshop.macsales.com/item/Other%20World%20Computing/MEG42M1500/
Memory- Doesn't have to break the bank, but, you must buy quality-
http://eshop.macsales.com/MyOWC/Upgrades.cfm?model=163&type=Memory&TI=1047&shoup grds=Show+Upgrades
http://www.datamemorysystems.com/viewcat.aspQ_C_E761
Graphics- a flashed PC 4x AGP card will give you the most for the cheapest
Sata Controller Card- the following is hard to beat:
http://eshop.macsales.com/item/Other%20World%20Computing/SATAPCI2P/
Or, get the bundle:
http://eshop.macsales.com/item/Other%20World%20Computing/SATAM500GPCI/
http://eshop.macsales.com/item/Other%20World%20Computing/SATAM10TBPCI/
If you need cheaper, or used, check:
http://groups.google.com/group/lemswap
or, eBay.
Good Luck!
G4 AGP(450)Sawtooth Mac OS X (10.4.8) 2ghzPPC,1.62gbSDRAM, ATI9800, DVR-109,(IntHD)120&160,LaCie160,23"Cinema Display

Choppy or Digitized Audio w Time Stretch

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