soundcheck;664210 Wrote: 
> John.
> Perhaps there is something going wrong on the USB controller side.
> 
> Or:
> 
> You could also try to set snd-usb-audio parameters, such as "nrpacks" .
> 
> I'm not sure though if you can do that on the Touch.
> 
> 

Hi Klaus, I did try nrpacks, it makes no difference for xruns, but does
significantly affect sound quality. 

There are several parameters avaivable for the basic usb driver but I
want to sit down with the source code and see what they do. 

The xruns do NOT seem to be in the alsa space, I'm not getting any alsa
log messages about any xruns until I get buffer settings very bad. I
think its something with the generic USB driver/hardware.

Another interesting tidbit is the firmware used. With an early 7.5.1
firmware I get LOTS of xruns with 88.2 (this is all aplay), but a
recent 7.5.1 has almost no xruns (still a few about two per song). This
is with everything else setup exactly the same. With 96 the early and
recent 7.5.1 give about the same results. SOMETHING in the firmware
changed which caused major differences in xruns. 

John S.


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