Is it possible to "play" successive notes in an orch score consisting of a melody by pressing a single key? (Prefer to use a key on an ascii keyboard but could also use MIDI.) So the idea is that successive pitches are determined by the score but p2 and p3 have indeterminate values that are dictated by key presses. Not too concerned about each tone's duration - this can either be a fixed value or not; just interested in being able to determine the time between successive onsets using key presses.



Maybe another way?
I can't think of any way to do exactly what you ask -- score events seem firmly based on time --, but how about just making a table of notes (plus other parameters that might be in the score, maybe using extra tables) and triggering those values in sequence with sensekey? (Assuming it works on your system -- it does for me under Linux, but there was a note at one time about it not working under Windows.)