[linux-audio-user] Re: [Alsa-user] M-audio USB audio devices

[Alexandre Ratchov]

On Mon, Jan 23, 2006 at 05:03:00PM +0100, chgans at free.fr wrote:
> Selon Alexandre Ratchov <alex-contact at caoua.org>:
> 
> > On Mon, Jan 23, 2006 at 03:35:59PM +0100, chgans at free.fr wrote:
> > > Hi all,
> > >
> > > Does anyone use an M-audio device like MobilePre or FastTrack with success?
> > >
> > > I've read in some archives that some peoples have try to use them, but i
> > have
> > > not find any clear feedback.
> > > Some talks about firmware loading, others talks about usb compliance
> > problem...
> > >
> > > I plan to use it with a laptop shipped with Debian/DeMudi with custom
> > recent
> > > kernel (>2.6.9).
> > >
> > > So if there is anybody outhere that is happy with its M-audio MobilePre or
> > > FastTrack, please let me know.
> > >
> > > regards,
> > > Christian
> > >
> > > PS: I am looking for a "cheap" USB audio interface in which i can plug a
> > > guitar or a bass and a stereo microphone (for percussion or acoustic
> > > guitar). I can easily buy m-audio devices, but the vendor doesn't have
> > > (many) edirol devices...
> > >
> > >
> >
> > hello,
> >
> > i've just bought the mobilepre; it is "usb audio class" compliant and
> > works on linux 2.6 and BSD.
> >
> > i didn't have enough time to test everything. This evening i'll have more
> > time to play with it. Feel free to contact me if you have specific questions
> > and/or if you want me to check something for you.
> Great! thanks.
> 
> What i want to know is if it is "well supported", i mean all input/ouput
> are usable, the sound quality is good (no noise), latency is OK (no large
> delay in audio path and control path).
> 

i'm not a professional, but imo the sound quality is correct. There isn't
much noise, i've tried to plug the output of my synthesizer to the input of the
sound card and then i've run:

	arecord -f cd | aplay -f cd

and imo, the result is good;

The mixer works, it's very simple; there are few controls (input gain,
output gain, dac gain, and direct monitor gain). The only feature that i
couldn't get to work on linux is the "direct monitor" (it controls the
amount of the input signal that is routed directly to the output).

i don't expect low latency from such USB hardware; i just plan to use it as
a simple full-duplex player/recorder. Do you want me to do some other tests?

> Do you know if it is an USB1 or USB2 compliant device?
> 

it is USB1.1 compliant; there is no proprietary and/or hidden features,
(even the direct monitor is compliant).

regards,

-- 
Alexandre