Thank you Runcell and Andrew–responses much appreciated.
I did finally discover that if you put the main button into play mode that you can then start/stop/reset a sequencer in the patch. Because I didn’t know that, my reset wiring wasn’t working as I was hitting play/stop on the main button to try to get it to reset.
I have looked at some of the tutorial videos from this guy on the miRack website, which have been helpful indeed; the ‘big button’ suggestion in this example seems very convenient.
I understand basic (subtractive and FM) synthesis, and had some experience with a Buchla and MS20 years back, but actually wiring it myself has been a bit more challenging, esp having forgotten all that. I am at this point trying to become familiar with the bewildering number of modules–I’m sure I will be back soon with more questions.