I've built a few devices that accept MIDI as a control signal and they don't work with the latest version of PD. I'm not sure but it looks to me like where a ctlout object used to send Channel , Controller Number , and Control Value it is only sending channel information if there is a channel change. This makes a lot of sense I guess to save bandwidth. First of all could someone confirm that this is what is happening . It would be a hassle for me now to rewrite all the firmware in these devices. They are all waiting for channel data each transmission. I'm not sure when this change in PD happened or whether it is something else that is going on. Everything seems to work for me under PD 0.34.4 in Windows but 0.37 under Linux is where I'm having problems. If indeed Channel Number is only transmitted when it changes is there an easy way to send it with every transmission till I get a chance to reprogram all my devices. Thanks! Jim