Hi Rednas, I am from Italy, and I am in constructing my real pipe organ, too. the real pipes are real pipes! Have you solved your two problem, wrote in your first post? --> Noteoff. This could be a problem when using say 8' and 4' on one channel. Say you press c1 and c2 together, but release c2 first. Then you get a noteof message for c2 on your rank, but it should be one, because the 4' at c1 adresses c2 also. --> Stopoff. If you put a stop off, you cannot turn the pipes off anymore, because apropriate midi messages will not be send. This means we need a noteoff on that channel, or for everynote pressed on that channel and height. I want to use a midi0128 for each rank of pipes (or at least two), that keep in memory what stops and what solenoid must play for every midi channel (keyboards and pedalboard). I think this solution is easy. I have channel 1-3 for keyboards and channel 0 for the pedals and the decoders midi0128 all connected on cascade metod by midi throw. But I had not think to your two problems.... If you have solved them let me know!. Thank a lot, Gu.