[alsa-devel] Need expert's advice - Fast Track Ultra (8R) dropping samples

Daniel Mack daniel at caiaq.de
Thu Oct 7 10:10:11 CEST 2010

On Thu, Oct 07, 2010 at 08:37:22AM +0200, Clemens Ladisch wrote:
> Felix Homann wrote:
> > Am 06.10.2010 16:38, schrieb Clemens Ladisch:
> > > this device does not use frequency feedback.
> > >
> > > What happens when you are recording something and then try to play
> > > something else with a different sample rate?
> > 
> > When I start recording at 44.1 kHz while playing a wav at 48 kHz the
> > playback gets very distorted, sounds like lots of missing samples.
> So this device expects the computer to take the sample clock from the
> capture data.   This is just like the UA-101; it should be possible to
> write a similar driver (with opportunities for code sharing, and AFAIK
> UAC 2 requires such a feedback mode, too).

Ah, that makes sense, yes. UAC2 calls this mode "implicit feedback".
Felix, can you provide a dump of "lsusb -v" for this device?


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