From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Mack <daniel@caiaq.de>
Subject: Re: Need expert's advice - Fast Track Ultra (8R)
 dropping samples
Date: Thu, 7 Oct 2010 10:10:11 +0200
Message-ID: <20101007081010.GZ7159@buzzloop.caiaq.de>
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To: Clemens Ladisch <clemens@ladisch.de>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org, Felix Homann <linuxaudio@showlabor.de>
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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?

Daniel