Thanks! I’ll post the code for the beta in Norns:code review soon. I added some new features last night, such as independent track tempos and sequence lengths.
Yes, it would be very easy for each track to have the option to be a midi or internal synth track (or both). I know loom, for example, can do both.
I think that the challenge to adding more and more features isn’t the code, but the UI. The limited screen space on Norns and resolution of Grid forces you to put a lot of thought into organizing the UI elements, or else to be a minimalist with respect to features.