It is :) For completeness (and to close a 3yrs old ToDo item); i've just added jack-stdin; fixed a few typos on the way, and added 8+32 bit integer support. I've re-named the project to JACK-stdio. JACK-stdio version 1.1 is out! http://rg42.org/oss/jackstdio/ git://rg42.org/jack-stdout If you ever felt like you need to use 'sox' as effect-rack for JACK, here's your chance: jack-stdout system:capture_1 system:capture_2 \ | sox -t raw -r 48k -e signed -b 16 -c 2 - \ -t raw -r 48k -e signed -b 16 -c 2 - \ tremolo 5 100 \ | jack-stdin system:playback_1 system:playback_2 have fun, robin