> I have some problems with 6 channel sis 7012 device - I'm using it as 3
> stereo channels. I trigger 3 different instances of aplay at once and I get
> underrun messages from aplay.
>
> What does this mean ?

It happens because aplay can't send audio data as fast as the card needs it.

> How to solve this  (bigger buffer? ) ?

Yes, or reduce system load, or run aplay at higher priority (very
recommended, since it requires very little cpu time and low latency), or
buy a faster disk.


--
Giuliano.


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