MIDI feedback loops

Per a different thread discussion, I've started using Plogue Bidule to host most of my Audio units and I'm using IAC to send MIDI from MainStage to Blogue.
However, I frequently get popup dialogs warning me that there is a MIDI feedback loop and I'm prompted to "go online" or "stay offline". I'm doing the latter and everything works fine but I'm wondering how to fix this problem (or at least get rid of the dialog).
I'm not near the machine at the moment but I'm wondering if MainStage is automatically receiving MIDI back from those IAC ports and just blindly sending events out again? If that's what's happening, I can probably create some more dummy MIDI devices and associate them with those ports but it's a pity to have to do this.

This doesn't really answer your question, but I am using Reason with MainStage through rewire and can remote control reason fine with MIDI. Once I launch Reason I can create an external instrument channel strip in MainStage. Then I can set the port to Reason and choose a channel, and then map one of my knobs to send a specific midi controller on this external channel strip. Then Reason receives this midi controller whenever I turn the knob on screen. I imagine you should be able to do something pretty similar with Live in slave mode...

Similar Messages

Midi Apple Loops Problem

Hi,
Im having some issues with the midi apple loops loosing some effects that are heard when previewed in the media section, then once dragged into the arrange it'll loose for example a prevalent reverb and other notable sonic qualities...even when the plug-ins that are usually bypassed once dragged into arrange window are activated its still lacking from the preview loop heard.
Wa gwahn?

This is normal behavior. If you want the midi loop to sound exactly like auditioned in the preview you will have to create an audio track and move the midi region onto the audio track, and then it will sound exactly the same.

Any way to save data in loop without using shift register or feedback loop

Hello all
I was thinking, is it possible to save data in a loop to next iteration without the use of a shift register or a feedback loop?
I need the possibility to reload data within a loop from a lvm file, but I want to use the same data until i load some new ones.
The reason why I don't want to use the shift register or feedback node is due to speed, even though I am not sure if the shift register
actually moves all the data from one register to another, or if it is stationary until a change in the data occur.
The data I want to reuse is medium-large (6 force measurements, 2 pressure, 1 flow channels)of about 10sec data in each file with samplingsrate of 2kHz..
In my analysis program I have many CPU demanding calculations and 3D graphs, so I just want to minimize the CPU load as much as I can for each part of the
software..
I have attached a small VI to explain what I am talking about.
I now I shouldn't use the express VI, and I am going to change that as well - this is just a proof of concept!
Hope you guys can help me understand this shift register better...
Thanks!
- Tommy
Running LabVIEW 2009 32bit SP1 on Windows 7 64Bit
Solved!
Go to Solution.
Attachments:
visual.vi ‏34 KB

tombech wrote:
[...]The reason why I don't want to use the shift register or feedback node is due to speed[...]
Tommy,
shift register are the fastest you can ever get...........
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

Plug-Ins in a delay feedback-loop

I would like to set plug-Ins in a feedback loop from a delay plug-In
maybe in a simalar way like this:
from a audio track "send", i route the send signal in a delay. the delay output goes after in other plugins (filter, reverb, pitch shifter) and comes back in the delay input, but only maybe maybe 20%-30% of the output volume.
Does anybody know how to do this routing?

Admittedly, I had not tried the routing I had posted. I was just "thinking it through"... evidentially, not very well...
I knew I'd read multiple posts over at Sonikmatter about this sort of thing. Here's the first one I came across doing a quick search:
http://community.sonikmatter.com/forums/index.php?showtopic=7282
See if that gets you closer to what you had in mind...

Gmail IMAP "Copying message" feedback loop

Yesterday I sent an email with 10mbs of attachments from mail.app through gmail imap. after the message sent, I noticed that the spinning icon next to the gmail inbox was perpetually spinning. in the 'activity' window, it says:
Gmail Synchronizing with server
copying message
I figured mail.app and gmail were synchronizing the email. so i let the process go for a few hours yesterday, when I noticed that no new email had come in via gmail, so i checked the account through the web browser. sure enough to find new email, but nothing coming through to mail.app. so i cancelled the process and but the activity status just said "STOPPING: copying message" and didn't go away. So I restarted mail.app. as soon as mail.app was back up and running, the "copying message" status reappeared.
Last night, I let the operation go throughout the night, to wake up this morning with nothing changed. So this morning I checked my "recovered messages (Gmail).mobx" folder to see several 345mb message files. I removed the whole "recovered messages (Gmail).mobx" folder to the desktop and restarted mail.app but I still have the same error.
Incidentals:
The original message with the 10mbs of attachments was a series of 47 photos. Originally, I had dragged full res photos(6-7mbs/photo) into a mail.app message and chose "medium" from the "image size" pop-up at the bottom pane of the message.
My theory is that in between placing the photos in the message and mail.app resizing them, mail.app and gmail tried to save a draft of the message to the server with all the photos at their original size (they might have been somewhere around that 345mb mark). And somehow mail.app is freaking out continually trying to upload a draft of the message with 345mbs of attachments. just a theory.
how do i get mail.app and gmail imap out this weird feedback loop?
Message was edited by: Ed Fladung

I had the same problem myself, except that the message contained over 200 pictures. The actual email was only 7MB, but Mail must have decided to create a draft before it resized the pictures. I only noticed the problem after Mail had consumed over 1.5GB of my limited bandwidth and was taking up almost 4GB in RAM, and a lot more in swap. The solution here worked, but it's unfortunate that I needed it at all. Why would I ever want Mail to upload attached photos to an IMAP server at their original size, especially after the final version of the email with resized photos has already been sent? This NEEDS to be fixed, since it could be a huge problem for someone who is less computer savvy.

What is the block diagram of the feedback loop when op mode is set to velocity?

On 7344s, is the feedback loop changed when the operation mode is set to velocity? Is it still a “position feedback” loop with just a ramp at the input? Or is there an additionnal derivitive to find the speed and the input command is a speed?

When making a move where the encoder is not configured for velocity feedback, the control loop uses actual position vs. expected position as a function of time to correct for the velocity output. However, when the encoder is configured for velocity feedback, we actually use the velocity based on encoder feedback in the control loop and this also allows us to use the functionality of the Kv term to smooth velocity response.
Best Regards,
Chris D
NI Applications Engineer

Speedy-33 feedback loop

Hi, i'm using speedy-33 as my DSP target and i wish to perform a feedback loop. i tried the example found in the NI website but it shows error that the array size is mismatch.
Does anyone know how the data flows?
Let say when i create an analog input, it is a 1-D array. Inorder to create a feedback loop i need to create an array of known size 1st, am i right to say that?? From there onwards, wat are some of the ways that i can can my array size or when do i need to alter my array?
Can anyone pls help??
Thanks

Hi steven,
Thanks for the reply,
Using labview 8.2, DSP target speedy-33
Currently i'm trying to get a feed back from my sample delay function then add back to my signal to create a reverberation effect.
problem
1)the waveform i see from my waveformchart are square wave.
2)I try to set my frame size at 1024 but the programm just run for a few sec and stop.
3)my audio signal sounds like transformer singing!!
can someone help me point out where my problem lies on??
Thanks in advance.
Attachments:
Feedback using for loop.vi ‏49 KB

Feedback loop for taking integral

Hello. I'm trying to model some mathematical equations in LabVIEW and trying to the find the integral using feedback node.
Here is the equation I'm trying to model:
i = integral([VBATT - i*R - i*(dL/dt)]/L), where L is a function as well.
At the output of i I get 0. I'm assuming I have to put an input into the feedback loop but I'm not sure what to do here. Any help would be appreciated. Attached is my VI as well.
Attachments:
project3.vi ‏24 KB

OriolesFan wrote:
Why are you using a feedback node?
Feedback nodes are for storing information from one iteration and using it in the next. Since you don't have any loop and your VI runs once, it will return the default value that the feedback node is initialized with. Thuse zero.
The i I solved for is needed as an input. Those are differential equations.
I think I did this wrong actually. I modeled these equations in Simulink but used a transient response to get the results, so I think I need some other module in my LabVIEW to do this. I was trying to take my equations from Simulink and trying to model it in LabVIEW.

Midi auto-loops unwanted

Lately when i record midi regions they are automatically looped over 8 or 9 times as soon as i finish recording the strikes. I'm wondering if I've accidentally turned on some sort of "auto-loop" feature. Any idea how to turn it off?

Yep, this one:
Uncheck it.

Midi apple loops disappear. Why?

All blue (audio loops) remain in the loop folder, I had greens before but all of sudden they has gone. I downloaded additional content, but says it's complete.

This is normal behavior. If you want the midi loop to sound exactly like auditioned in the preview you will have to create an audio track and move the midi region onto the audio track, and then it will sound exactly the same.

Midi Apple Loops sound different when dragged on to song

When ever I drag a green midi loop from Apple Loops to my song it sounds different. All the effects are gone. I tried to put som reverb on it but it doesn't sound like it does wheyn played in the Apple Loops bar.
How can I use the green midi loops from Apple Loops as they sound there with that effect. The blue audio Apple Loops works fine.
I had this same problem in Logic Pro 9

There are some differences between the audio file previews contained in the loop and the actual data, sometimes by error, sometimes intentionally so.
For instance, if you preview an orchestral instrument, you hear it with reverb, as that's kinda how it's intended to sound, but when you drag it into Logic proper, you don't get reverb - because you will have one global reverb you send all the orchestral instrument too, rather than a hundred individual reverbs on each instrument.
Stuff like that. It varies, but there's nothing broken as such.

Midi Guitar Loops

This might be a very old topic, in which case my apologies. I have all the Apple guitar loops, but want to expand my GarageBand library - particularly of midi loops because they are so much more adaptable. Ideally I would like to hear samples online and buy them on CD rather than as downloads because I use more than one Mac.
Can anyone suggest a good source please?

Ghostland Girl wrote:
an audio interface: {...} it's recording, but no sound comes out when I hit "play."
http://www.bulletsandbones.com/GB/GBFAQ.html#usecomputersspeakers
(Let the page FULLY load. The link to your answer is at the top of your screen)

Where are the MIDI Apple Loop files stored?

Am I the only one that wonders where the MIDI files are stored for GarageBand? The ones installed by iLife, the Jam Pack additions and any custom MIDI loops I create are nowhere to be found. Spotlight doesn't show any MIDI loop name I search and I have spent an entire day scrounging through just about every folder on my Mac looking for these puppies! Does ANYONE know where these files are stored?!!?

Alright, then...
You appear to be correct, in as much as the developer specification for the Core Audio Format has provisions for a "MidiChunk". Thank you so much for at least pointing me in the right direction. I still couldn't find any explanation for this issue on the website you referred me to (and had previously visited), but I did find a small explanation in an obscure Apple Tech Document.
What I would still like to know is:
1. How do you access the MIDI data within the .caf files? I haven't found any application that will extract or access that data.
2. When I create custom MIDI sequences within GarageBand and save them to the Loop Library (e.g. a piano track named "hoity-toity-supercilious-wankersequencedeluxe"), they show up in the Loop Browser but I still can't locate the actual file anywhere on my Mac. I know I can just open up a GarageBand file in Logic and then export the MIDI file out from there. But, I would REALLY like to just be able to find the file to begin with and skip that extra stage.
If I could just find the answers to these burning questions. Oh, and (singing) if I only had a brain!
Thanks again for getting me this far!

How to kill feedback loop?

I'm working on a project - no files are selected for recording, but there is feedback always on that's driving me nuts. Sorry, novice user here and I can't find a clue in the manual. Any idea?

Don't have a MBP but ut sounds to me like the internal microphone is feeding back.
Go into Utilities/AudioMIDI Setup and change the input to Line-IN, and or bring down the input volume.
Just a guess.
pancenter-

Feedback loop NI DAQ mx

Hi, I'm here to get some help on my program.... since our lab did not have control toolkit,
I had to build my simple PID program.. question is (I'm not sure if it's program question or not)
1. Will my pid work fine ? I just took the basic concept of PID and built it.. just like the picture above...
2. after let pid take care of the error, should I directly send it to the DAQ output ? or should I add something on to it ?
this might be a control question.. but I was really confused.. whetere I have to just send the pure error to my output(in this case, amplifier)
or I have to do something with either setpoint or the previous sesor reading(uncorrected)
we're trying to get the control toolkit sooner or later, but in the mean time, I have no choice but stick to this program..
please help me mr. NI
Thank you

Hi johnny,
Your PID logic seems to be sound and you should be able to take the output of the PID loop and wire it to the DAQ output. I'm not sure what you would do to it before you send it to the DAQ output anyways. Thanks.
Stephen Meserve
National Instruments

MIDI feedback loops

Similar Messages

Maybe you are looking for