Audio recording from USB

Hans Petter Selasky hps at selasky.org
Thu Jul 5 07:48:08 UTC 2018


On 07/04/18 23:41, Kevin Oberman wrote:
> I have an Audio-technia turntable with USB output and I want to use
> audacity to record from it. I have read the sound, mixer, and snd_uaudio
> man pages, but am still unable to get the configuration correct. sndstat
> shows the device (pcm4) but mixer only lists pcm0, the Conexant CX20590,
> which is marked as default in sndstat.
> 
> Messages on connection:
> uaudio0 on uhub3
> uaudio0: <BurrBrown from Texas Instruments USB AUDIO  CODEC, class 0/0, rev
> 2.00/1.00, addr 3> on usbus1
> uaudio0: Play: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Play: 44100 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Play: 32000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Record: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Record: 44100 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Record: 32000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Record: 22050 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Record: 16000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Record: 11025 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: No MIDI sequencer.
> pcm4: <USB audio> on uaudio0
> uaudio0: HID volume keys found.
> 
> Installed devices:
> pcm0: <Conexant CX20590 (Analog 2.0+HP/2.0)> (play/rec) default
> pcm1: <Intel Cougar Point (HDMI/DP 8ch)> (play)
> pcm2: <Intel Cougar Point (HDMI/DP 8ch)> (play)
> pcm3: <Intel Cougar Point (HDMI/DP 8ch)> (play)
> pcm4: <USB audio> (play/rec)
> 
> mixer -f /dev/mixer4 shows:
> Mixer vol      is currently set to  75:75
> Mixer pcm      is currently set to  75:75
> No line or mic.
> 
> I tried "cat /dev/dsp4.0" and got the expected stream of "junk" that looks
> like it is getting data from the turntable.  "junk" changes when I play
> something, so I think the hardware is all working to some degree.
> 
> Can anyone suggest where to go from here?

Did you try:
sysctl -a hw.snd.default_unit=4

--HPS




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