So how will the freeze function work? Sounded great on the demo.

Do you need a new pedal? If so what kind/specs?

I only have a hold pedal and expression pedal somewhere (but I didn’t like it)

If you plug your existing sustain pedal “one click” it can be used as FREEZE. If you want to have both HOLD and FREEZE then you just need a stereo splitter and then use two pedals. L = hold, R=freeze