Date: Fri, 7 Feb 2025 16:16:15 +0100 From: Jan Stary <hans@stare.cz> To: questions@freebsd.org Subject: M-Audio Fast Track Ultra 8R Message-ID: <Z6Yjv52_5C9BPkhG@www.stare.cz>
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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. 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"? Please excuse my ignorance. Where in the FreeBSD code can I look at the driver and see how exactly the device gets treated? Thank you Jan PS: M-Audio themselves have left users in the cold, abandoning the device. https://avidtech.my.salesforce-sites.com/pkb/articles/en_US/Knowledge/Fast-Track-Ultra-8R-Drivershelp
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