Hello, As you may know, mono compatibility is an important aspect of proofing a mix. Right now, I do so by taking my latest mixdown and doing: $ ecasound -i:mixdown.wav -f:,1 -o:jack,system -chmix:1 I thought it could be fun if this could be achieved in real-time in nama by issuing > Master mono Right now, doing this only plays the left channel, which isn't terrible practical, but summing to mono definitely would be. What do you think? Happy Easter, S.M. --