Anybody know of a good velocity-sensitive roll-up keyboard? I'm going to Costa Rica for a semester and I'd like to take a keyboard with me... in my pocket... I've seen a few out there, but none seem to be velocity-sensitive AND have MIDI or USB outputs. Several have one or the other, but I've not found both in the same product yet. Anybody know anything about these?

I hope this counts as "Pro Audio Gear" and has a place in this forum. If not, I'll post in the cheap gear forum.