On 30 November 2017 at 17:37, Tanu Kaskinen <tanuk at iki.fi> wrote: > I believe jack_client_open() should start jackd, but apparently that's > not working. I'm not familiar with how the automatic starting works, I > can only tell that PulseAudio doesn't deliberately disable the > automatic jackd starting. Thank you Tanu. I now have something that works (mostly!): Once pulseaudio is installed, I manually set the active profile for every card to "off" so that pulseaudio relinquishes control of the hardware. Then I install debian stretch's jackd2 package (I have not yet tried this using jackd1). I edit /etc/jackdrc to contain something like: /usr/bin/jackd -T -d alsa -d hw:USX2Y -P -S -n 2 -p 120 -r 48000 (I want jack to play through my tascam usb sound card hence the hw:USX2Y). At this point, I can test jackd using jack-play (from the jack-tools package) and all is good. Finally, I layer pulseaudio over the top of jack by installing the pulseaudio-module-jack package and setting ~/.config/pulse/default.pa to: .include /etc/pulse/default.pa load-module module-jack-sink channels=2 set-default-sink jack_out Once I've killed and restarted pulseaudio, a quick "ps aux | grep -i jack" shows me that the jack server has started, I get sound both through jack and pulseaudio. I now have a few questions about fine-tuning the stack (such as realtime priorities), but I'll start another mail for that. Thank you again.
