Hi,
The keyboard allows you to capture any set of keys as an arpeggio, but as the sound is really good I would like to make it more accessible to people that will not be comfortable hacking a keyboard. I will have a look at the chords but I am starting to think the best option is to design it around having twelve buttons or keys for chord capture and play back with a pot for transpose.
As for additional analogue inputs I bought some 4051 analogue multiplexers a while back. I haven't used them yet, but they get you a lot of extra inputs.
Thanks
Duane.