saam@bigblackbox:/tmp$ jack_lsp
system:capture_1
system:capture_2
system:playback_1
system:playback_2
system:playback_3
system:playback_4
PulseAudio JACK Sink:front-left
PulseAudio JACK Sink:front-right
PulseAudio JACK Source:front-left
PulseAudio JACK Source:front-right
saam@bigblackbox:/tmp$