Will the arpeggiator/sequencer be clockable by an analog signal from a drum machine or similar? This is not only a nice feature for compatibility with vintage equipment, but also allows things like custom rhythms that are easy to change on the fly.
It's a great idea and something that we would like to include. It may require a special cable is all. We use a stereo jack for the sustain pedal and the ring contact is un-assigned at present.
Whilst it's not something that will be there on release (mainly due to the special cable) I am totally with you on this and I really like the suggestion.