Dear All, I am learning chuck and I've made some scripts for the monome 40h interface (if someone wants I can post them). I really need to sync my script with another software, using MIDI. I saw on the users mailing list ( https://lists.cs.princeton.edu/pipermail/chuck-users/2006-April/000503.html ) that midi sync wasn't possible. I didn't really understood why at first, because I thought we just have to make a midi input handler that waits for MIDI clock messages, just like the example in the message : 0 => int device; // number of the device to open (see: chuck --probe) MidiIn min; // the midi event MidiMsg msg; // the message for retrieving data if( !min.open( device ) ) me.exit(); // open the device spork ~ handleMIDI(); fun void handleMIDI() { while (1) { min => now; // wait on the event 'min' while( min.recv(msg) ) // get the message(s) { if (msg.data1 == 248) { // MIDI Clock // Do clocky stuff, count to 24, determine delta-now, whatever } } } } So I wrote a little loop waiting for midi clock message, similar to the script above. I never received midi clock messages... (I am sure they are sent using a MIDI monitor). I read on chuck forum that MIDI clock messages were not parsed. So I had a quick look into Chuck source code and try to found why. I said quick look because I do not understand the whole code to 100%, I've just tried to find more about these MIDI clock messages. I saw that in the midiInputCallback, the midi time code and tick messages (and some other midi messages) are ignored depending on some RtMidiInData flags : the ignoreFlags, initialized to true (ignoreFlags set to 7 in fact) in the constructor. If these flags are true, the size of the message is set to 0 and it is ignored. I saw that there is a method called RTMidiIn::ignoreTypes that can changes these flags. But my BIG question : how to access this ignoreTypes method in chuck language? I recompiled chuck with ignoreFlags initialized to 0. And now I received them... So what is the problem with the midi clock messages? Why disabling them? Can the end-user re enable them without recompiling? Thanks and congratulations for chuck, this is really wonderful, Best regards, Julien.