Re: snd-usb-audio - Driver for M-Audio Fast Track Pro

["Clemens Ladisch" <cladisch@fastmail.net>]

peter.oehry@gmx.li wrote:
> My Name is Peter Oehry and I own a Fast Track Pro USB interface from
> M-Audio.
> 
> Maybe you can help me to improve the usb driver to support the 24-Bit  
> capability of this device.
> 
> What I found out so far:
> 
> The device has two configuration sets. The first one (chosen by  
> default) supports only 16-Bit. This mode works without any problems.
> As I switched to the second configuration (by writint 2 to
> /sys/bus/usb/devices/1-1/bConfigurationValue) more Interface
> alternatives can be seen. I could mail the complete device  
> description.

Please do show the "lsusb -v" output.

> How can I add a quirk that the Configuration set is chosen by default?

There is no predefined quirk for this.
I guess you'd need another boot quirk.

> In this configuration I was able to connect and get some sound through  
> the 24-Bit mode. But the sound seems to be a little bit scrambled up.  
> One chanel has only a bit of the propper sound with very high  
> distortion and the other channel has almost the right sound. But also  
> higher distortion than in 16-Bit mode.
> 
> Does any body know this sort of problems? Maybe another device has a
> similar problem.

Some other M-Audio USB devices use big-endian samples.


Regards,
Clemens

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