They need to hear it in arbitrary segments at any given time, instantly, as needed by the conductor.

My solution is to: map the currently-used choral pitches to the keys on the keyboard; create a new mapping as soon as I run out of empty keys; and mark in the piano score where to change mappings - much like changing organ stops in performance.

My question is: can PianoTeq support loading each of these key mappings (combination of the master tuning file containing all pitches in 72tet, and a .kbm mapping file for each momentary pitch collection) with a single press of a footswitch?

Alternately, I could create a different .scl file for each subset of 12 pitches; but I still want to instantly load it via footswitch during play.

I've been through some of the manual and it's inconclusive to me, but MIDI technology is not my strongest suit. Any help would be appreciated!