Hi Peter,
I was thinking
of just using Audacity to generate a pulse out of the
line out, then measure the signal on the other channel.
Is there any software I can use to make life easier?
Jack_delay from
https://kokkinizita.linuxaudio.org/linuxaudio/
I've used Jack_IOdelay (included with jackd2 on Debian) to measure
soundcard driver & jackd performance in the past.
Cheers!