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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Tue, 26 Apr 2011 10:47:01 +0200
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Cc: Clemens Ladisch <clemens@ladisch.de>
Subject: Re: uaudio, M-Audio FastTrack Pro device - sound distorted
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On Tuesday 26 April 2011 10:10:21 Clemens Ladisch wrote:
> Marcel Bonnet wrote:
> > I'm using the M-AUDIO FastTrack Pro USB audio interface, but every time I
> > play or record, the sound get distorted.
> > 
> > uaudio0: Play: 44100 Hz, 2 ch, 16-bit S-LE PCM format
> > uaudio0: Record: 48000 Hz, 2 ch, 16-bit S-LE PCM format
> 
> This device uses one internal sample rate; using different rates for the
> playback and capture interfaces won't work.
> 
> AFAIK there are some undocumented constraints on which configurations
> and alternate settings can be used; and in some alternate settings, the
> device uses big-endian samples.  This cannot be handled with the generic
> parts of the uaudio driver; it requires device-specific workarounds.
> 
> There is an outdated patch that tries to make this device work on Linux
> on this page: https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3249
> 
> 

Try to set:

sysctl hw.usb.uaudio.default_rate=44100

Then replug the device.

We could possible make a workaround for this.

--HPS