Hi Paul, for testing the OBOS Midi Kit 1 I have used your test application as a starting point and wrote MidiPlayer (in the same directory as your test application). It can play a midi file and sends the midi evens to a Midi Kit 2 BMidiLocalProducer. This producer can be connected to e.g. MidiSynth 1.6 so you can hear what is played! I have not tested MidiPlayer with your implementation of BMidi and BMidiStore but it should be possible to link it to them instead of the BeOS libmidi.so. - Michael PS: I have started with live streaming of midi events from any Midi Kit 2 producer to TiMidity++ (the GPLed midi software synthesizer). Actually it works already, but the latency is quite high (around 1 second, maybe less), so it is not really usefull for a live performance :-( I will probably release it in this week at BeBits. Someone interested in testing it before the official release?