Hi,

Does it communicate with alsa-lib pulse plugin? Or is it the direct ALSA device access?

Ah, good question. I'm not sure how to determine that but looking into it. Tried strace but I wasn't sure what to look for in the deluge of info.

Do you mean that the sound from arecord gets garbled?

Correct : playing back the file just produced (arecord -f S16_LE -c 2 -r 44100 arec_44k.wav), sound is normal until I started audacity, then the rest of the audio is 10x accelerated.

arecord, is it over pulseaudio (with alsa-lib pulse plugin)?

Probably ? alsa-lib is installed and pulseaudio running normally, and I just gave default options to arecord.

No, I mean the way to trigger without audacity

I understand. I haven't found a simpler way (yet).

Thanks, Chris