uaudio, M-Audio FastTrack Pro device - sound distorted

Clemens Ladisch clemens at
Tue Apr 26 08:26:29 UTC 2011

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There is an outdated patch that tries to make this device work on Linux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:


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