Re: M-Audio Fast Track Ultra 8R

Hi Jan,

On Friday, February 7, 2025 4:15:34 PM CET Jan Stary wrote:
> I got my hands on an M-Audio Fast Track Ultra 8R,
> an USB audio interface; eight tracks, 24/96, nice.
> It attaches like this on FreeBSD:
> 
> ugen0.6: <M-Audio Fast Track Ultra 8R> at usbus0
> uaudio0 on uhub2
> uaudio0: <M-Audio Fast Track Ultra 8R, class 239/2, rev 2.00/1.51, addr 6>
> on usbus0 uaudio0: Play[0]: 96000 Hz, 8 ch, 24-bit S-LE PCM format, 2x4ms
> buffer. (selected) uaudio0: Play[0]: 88200 Hz, 8 ch, 24-bit S-LE PCM
> format, 2x4ms buffer. uaudio0: Play[0]: 48000 Hz, 8 ch, 24-bit S-LE PCM
> format, 2x4ms buffer. uaudio0: Play[0]: 44100 Hz, 8 ch, 24-bit S-LE PCM
> format, 2x4ms buffer. uaudio0: Record[0]: 96000 Hz, 8 ch, 24-bit S-LE PCM
> format, 2x4ms buffer. (selected) uaudio0: Record[0]: 88200 Hz, 8 ch, 24-bit
> S-LE PCM format, 2x4ms buffer. uaudio0: Record[0]: 48000 Hz, 8 ch, 24-bit
> S-LE PCM format, 2x4ms buffer. uaudio0: Record[0]: 44100 Hz, 8 ch, 24-bit
> S-LE PCM format, 2x4ms buffer. uaudio0: Single command MIDI quirk enabled
> uaudio0: MIDI sequencer.
> pcm3 on uaudio0
> uaudio0: No HID volume keys found.
> 
> Everything seems to work, recording the 8 channels.

good to know. That's quite ancient, I tried to get one second hand long time 
ago. IIRC the uaudio driver even has a section specific to the Fast Track 
Ultra, exposing the hardware mixer, which is not supported on other devices. 
Someone really loved the Fast Track Ultra, it seems.

> 
> The device doesn't seem to be USB class-compliamt, though.
> Class 239 (= 0xef) is "miscelaneous", i.e. not audio, which is 0x01.
> https://en.wikipedia.org/wiki/USB#Device_classes
> 
> I am trying to make this work on OpenBSD
> https://marc.info/?l=openbsd-misc&m=171972890415337&w=2
> where it only attaches as ugen, not uaudio.
> 
> I would like to learn here what it is that FreeBSD does
> while trying to attach the device, given that it is, apparently,
> not an adio-class compliant device.
> 
> Is there a quirk that makes the kernel go
> "oh, but it is actualy USN audio device, even
> if it does not report as such; act accordingly"?

I think there's a quirk for that, grep for "FASTTRACKULTRA" in src and you 
should find the relevant pieces.

Hope this helps

Flo