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ReaXcomp - Zipper noise is back Issue Tools
issueid=2476 05-13-2010 03:10 PM
Human being with feelings
ReaXcomp - Zipper noise is back

Problems in/with your version control system?

Zipper noise on gain changes in ReaXcomp was fixed in version 3.2 but in 3.52pre4 it's definitely back!


EDIT: Same for ReaDelay and ReaVocode!
Issue Details
Issue Type Closed Issue
Project Deprecated REAPER issue tracker
Category Plugins
Status Live With It For Now
Priority 5 - Medium
Affected Version 3.51
Closed Version (none)
Yes votes 1
No votes 0
Assigned Users (none)
Tags (none)

05-13-2010 03:26 PM
Administrator
 
Bonus points if you narrow down the version where it started!
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05-13-2010 03:34 PM
Human being with feelings
 
Haha! Funny guy, that Justin! :D
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05-13-2010 03:41 PM
Human being with feelings
 
Yeah, I think I can live without bonus points ;)
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05-13-2010 05:31 PM
Administrator
 
I'm not convinced that it changed on our end, so if you want it fixed, telling us the version that it regressed would be helpful.
Reply
05-13-2010 09:07 PM
Administrator
 
Can't reproduce zipper noise. By any chance are you using the standalone VSTs?
Reply
05-13-2010 11:45 PM
Human being with feelings
 
What, you can't reproduce this with a sine wave signal? You need better ears schwa. Of course I'm not using standalone VSTs.

Not sure I would hear it on loudspeakers. But on headphones I can year zipper noises in those plugins when moving volume faders on a looped sine wave signal.
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05-14-2010 12:59 AM
Human being with feelings
 
Now, now, don't insult the devs. :D
Reply
05-14-2010 01:02 AM
Human being with feelings
 
I'm not insulting! But do I really need to make projects which show the zipper noise? I'm so lazy :)
Reply
05-14-2010 04:55 AM
Administrator
 
No, with reaxcomp on a sine wave, I cannot hear zipper noise (buffer size dependent quantized changes in level) when moving reaxcomp's gain slider (with a reaxcomp band set to compress the sine frequency), or ReaDelay's wet/dry sliders.
Reply
05-14-2010 05:34 AM
Human being with feelings
 
I can schwa.

Here a project to demonstrate: reaxcomp-zipper-noise.rar (5.61 kB)


I also clearly hear it on my Technics HiFi speakers.


During live tweaking I even get some crackles in the sound, not just the zipper whine. In ReaVocode I don't get the zipper whine. Only small crackles there.


Voxengo SPAN shows the zipper whine as three spikes:

reaxcomp-zipper-noise.png

These three spikes are the zipper noise I think. They are not there when not teaking the gain faders. Same spikes are there in ReaDelay too.


Hope you this helps. And I hope you also can hear the artefacts in ReaVocode. Otherwise I need to record a live output to show you ...
Reply
05-14-2010 08:03 AM
Super Moderator (no feelings)
 
Can't repro either, neither with your test project nor with my own.
Here's yours, 55Hz is low enough to see single waveforms and envelope at the same time



Here's mine, 440Hz, Reaxcomp band 2 gain automation controlled:


What are we looking at on your screenshot?
Reply
05-14-2010 08:40 AM
Human being with feelings
 
Quote:
Originally Posted by Steindork
What are we looking at on your screenshot?
6kHz to 20kHz while tweaking the gain fader of single band in ReaXcomp. I've recorded the automation and on playback I hear that strange sounding stuff. I don't get this when doing it in ReaEQ for example.


Maybe soundcard related? I'm at 48kHz, 256 samples ASIO (RME HDSP9632).
Reply
05-14-2010 08:45 AM
Human being with feelings
 
Here rendered: reaxcomp-zipper-noise-output.rar (1.56 MB)

Please don't tell me you don't hear it! :)
Reply
05-18-2010 04:27 AM
Human being with feelings
 
Why so quiet now?
Reply
05-18-2010 07:14 AM
Human being with feelings
 
I can reproduce it only if moving the second band,
if I use 60 Hz sine wav.

Here's the project (simply press play):
zippernoize.zip
Reply
05-18-2010 07:29 AM
Administrator
 
The zipper noise in all of the reaplugs that was fixed a few months ago was caused by buffer-size dependent non-smooth changes in parameter values, that zipper noise is gone. The artifacts you are now identifying are not related to buffer size, instead they are byproducts of the specific audio processing that occurs.

As an analogy, when using a delay, adjusting the delay length during playback will always cause either a glitch in the audio, or a pitch change, because there is no way to smoothly transition from one time position to another without changing pitch (or doing some extreme timestretching) during the move. The ReaXComp artifacts when changing parameters during playback are similar, they are not caused by a bug or parameter not being smoothed properly.
Reply
05-18-2010 07:40 AM
Human being with feelings
 
And there's no way to make this disappearing?
Reply
05-20-2010 12:04 AM
Human being with feelings
 
That's the thing I hate in digital audio. All the time these weird noises, digital artefacts and buffer issues.

Simple volume adjustments causing such problems :(
Reply
05-20-2010 12:18 AM
Human being with feelings
 
Quote:
Originally Posted by schwa
no way to smoothly transition from one time position to another without changing pitch (or doing some extreme timestretching) during the move.
But if you change this slowly it is far less noticable, why not
introduce a function that slowly changes the value instead
of as fast as mouse movement, it would decrease the noise
at a cost of slight response delay.
Reply
05-20-2010 01:48 AM
Human being with feelings
 
Over sampling interpolation?
Reply
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