Re: [LAU] M-Audio Fast Track Pro: unreliable, distorted recording

On 04/17/2014 04:50 AM, Morten H wrote:
>> yes, try:
>> CONFIG_USB_DYNAMIC_MINORS is not set
>> CONFIG_USB_SUSPEND is not set
>> Guillaume
>
> I have searched for a long time for other people who have this problem, and
> this is the only place I have found an exact description of what I am
> experiencing:
>
> Lewis Pike's problems with his M-Audio Fast Track Pro match mine almost
> exactly.
>
> When I connect the FTP in order to record (just ordinary S16_LE, 48000KHz,
> stereo), one of three things happen: Either it just works, or I get an
> accompanying hiss or crackling sound, following the recorded material in
> intensity, or I just get insane noise that drowns out everything. The three
> cases occur equally often more or less, but it's hard to tell.
>
> In the second case (the one with the crackling sound) I have tried dumping
> the recorded data to see if I could discover any pattern, and apparently the
> most and least significant bytes are always equal for all samples. This
> problem can occur at any time by the way, for example after a couple of
> successful recordings, suddenly I get one with the crackle problem. This is
> maybe the most annoying thing, the fact that I can't reconnect the FTP until
> it works, and then rely on it to continue working.
>
> I record with arecord, doing something like this: arecord -D hw:1,1 -d 3 -c
> 2 -r 48000 -f S16_LE test.wav
>
> After reading this thread, I tried loading the usb audio module with
> modprobe snd_usb_audio vid=0x0763 pid=0x2012 device_setup=0x03 enable=1
> nrpacks=1
>
> And then recorded something with arecord -D hw:1,1 -d 3 -c 2 -r 48000 -f
> S24_3BE -t raw test.raw
>
> And I get exactly the same result Lewis Pike described: Sometimes it works,
> and I get a perfect 24bit recording, and sometimes I just get loud white
> noise.
>
> I have checked the kernel options, but I don't have either
> CONFIG_USB_DYNAMIC_MINORS, or CONFIG_USB_SUSPEND enabled, though I can't
> find CONFIG_USB_SUSPEND at all in my kernel. I'm using kernel version
> 3.12.13 by the way.
>
> I really hope somebody can help with this, beause the FTP is completely
> useless to me as it is.
>
> Thanks in advance,
> Morten Højer
> Denmark

Have you eliminated the possibility of intermittent hardware issues with
the FTP? The symptoms suggest that to me.

-- 
David W. Jones
gnome@hawaii.rr.com
authenticity, honesty, community
http://dancingtreefrog.com
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