Hi Nick, On Sun, 18 Oct 2009, nick bailey wrote: Since Non is a pretty immature program, it's inflexible about the Transport. When initializing, it always wants to be the transport master, and doesn't take action of another program takes over. That's why it's unstable. The transport is the way to go. One way would be to take it upon yourself to fix Non's transport. You will learn a lot of the in's and out's that way. The JACK Transport is a Good Thing. Some things about it that aren't easy to understand: * The program who is transport master can *lose* this status at any time without notification. You must not write your program with logic that says "If I'm the master... calculate this way, but if I'm a transport slave.... calculate some other way." * Because of that, always program your audio code as if it's *always* the transport slave. Set up the Transport Master code elsewhere. * When you supply the Bar:Beat:Tick info, it needs to come evenly. Your ticks-per-beat and beat-per- bar needs to align. * Beware of frames-per-tick roundoff error. It's natural to calculate frames-per-tick, round it to and integer, and use that as a basic building block. However, it will result in tempo drift. HTH, Gabriel