Mine
public text v1 · immutablegrants ~ # speaker-test -twaw -D ch40dup -c4
speaker-test 1.0.14
Playback device is ch40dup
Stream parameters are 48000Hz, S16_LE, 4 channels
WAV file(s)
Broken configuration for playback: no configurations available: Invalid argument
Setting of hwparams failed: Invalid argument