JackMiniMix is a simple console based JACK client that mixes a number of stereo inputs into a single stereo output. The gains of each of the input channels can be queried and controlled by sending it OSC messages. http://www.ecs.soton.ac.uk/~njh/jackminimix/ I have also written a perl module which talks OSC to the mixer, making it very easy to control. http://search.cpan.org/~njh/Audio-JackMiniMix/ nick.