[LAU] : Cracking sounds

[Pieter Palmers]

Mysth-R wrote:
> 
> 
> 2008/9/23 Pieter Palmers <pieterp at joow.be <mailto:pieterp at joow.be>>
> 
>     Mysth-R wrote:
> 
>         Hi,
> 
>         I've got a strange behaviour with my midi controller and/or
>         freebob/ffado.
>         I made a pure data patch, with a midi learn function. So I can
>         control everything with my midi controller.
>         When I use jack with Freebob or ffado (I tested both) and a
>         Presonus Firebox, I got cracking sounds every time I move
>         faders, pots from my Midi Controler.
>         When I use jack with alsa and a poor usb berhinger UCA202 it
>         works perfectly : no cracking sounds
> 
> 
>     Is your midi controller attached to the Presonus box or is it a USB
>     midi controller?
> 
> 
> I tried with USB and directly attached to the Presonus. My controller is 
> a Korg microKontrol, but I tried with another controller too (an EMU I 
> think)
> I also tried with Jackd and Jackdmp , cause I am on Gentoo 64bits.

Strange...

>  
> 
> 
>     What settings do you use for jackd?
> 
> 
> My settings are :
> 
> /usr/bin/jackd -R -dfirewire -r48000 -p256 -n3
> 
does it happen with higher buffer sizes too?

try increasing the priority of jackd to 65:
/usr/bin/jackd -R -P65 -dfirewire -r48000 -p256 -n3

I suspect that it has something to do with the kernel layer since it's 
present in both freebob and ffado.


Greets,

Pieter