@cfry Slow is fine with me and I am generally not going to exceed a post a day anyways unless I can just give a quick answer that I don't have to think about much. So the output of [r chs-$0] is a two element list, channel number and a one or a zero? What is the right outlet of your once? bang when reset or something else? are they how you are implementing groups? this screen shot is one group with two synths? I think I got a bit hungup on the tracker aspect and was not quite seeing what you were trying to do. We should get this sorted out quite nicely after a bit of a Q&A and get you a more flexible and dynamic setup in the process.