Hi mikelevins,
in the meantime, I always found that some sort of foot control does complement very well the PICO (not only!).
Be it for changing tonics, scales or settings inside the plug-ins or other powerful things.
It is possible (my 2 cents to John's good explanation ) thru program change to alter the sounds in Alchemy.
I remember doing it with Ab LIVE with midi clips, was able to change Bank and programs, just not collections... (miss something there)
Who am I (simple musician, not programmer) to talk about fantastic Belcanto and powerful EigenD, just marvels; and what we can achieve/ control with the Eigenharp's either on stage performing, in the studio or just having fun "jamming"
Hope this helps a bit more...
keyman