"Zipper noise" can occur in digital audio, when there is quick volume changes. 
In hardware, a failing digital potentiometer and or a failing bypass filter 
capacitor that allows noise to modulate on top of the volume curve. Still see 
this in digital potentiometer IC chip circuits from time to time. 

A very annoying sound. Might be experiencing the digital equivalent. 
Maybe some sort clash of sample and control rates?



-PBS 


=============================================


--- julien@MAIL.UPB.DE wrote:

From:         "Jeanette C." 
To:           CSOUND@LISTSERV.HEANET.IE
Subject: [Csnd] HRTF opcodes and zipping despite no warnings and highest settings
Date:         Thu, 6 Jun 2019 11:11:57 +0200

Hey hey,
I get some kind of zipping or crackling noise using hrtfearly and hrtfreverb 
despite using an ifade (fade size) of 1, ksmps of 1 and a samplerate of 48kHz.

Also, with these settings I get no more warnings about possible artefacts due 
to my trajectory. The trajectory in question is an ellpise in the x-y plane 
and a slow sine patter up and down the z-axis. The signal does not get closer 
to the boundaries of the defined room than one metre. The movement should be 
slow enough as well. I'm sure I have moved signals faster than that before.

Any ideas what it might be or where I might tune the orchestra?

Best wishes,

Jeanette

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_____________________________________________________________
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Hey hey Partev,
thanks for your reply. I was contacted off-list and it appears that due to 
changes in Csound this particular problem was introduced. It should now be 
fixed in git.

Best wishes,

Jeanette

-- 
  * Website: http://juliencoder.de - for summer is a state of sound
  * SoundCloud: https://soundcloud.com/jeanette_c
  * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
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Stay with me a while <3
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yes, it was to do with a build setting. It would not show up in debug builds, so that was another complication. 

Victor Lazzarini
Dean of Arts, Celtic Studies, and Philosophy
Maynooth University
Ireland
> On 8 Jun 2019, at 09:42, Jeanette C.  wrote:
> 
> Hey hey Partev,
> thanks for your reply. I was contacted off-list and it appears that due to changes in Csound this particular problem was introduced. It should now be fixed in git.
> 
> Best wishes,
> 
> Jeanette
> 
> -- 
> * Website: http://juliencoder.de - for summer is a state of sound
> * SoundCloud: https://soundcloud.com/jeanette_c
> * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
> * GitHub: https://github.com/jeanette-c
> * Twitter: https://twitter.com/jeanette_c_s
> 
> I saw your smile
> Stay with me a while <3
> (Britney Spears)
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>       https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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