Change all linen, linseg, and expseg opcodes to linenr, linsegr, and expsegr, respectively, except for a de-clicking or damping envelope. This will not materially change score-driven performance.

Add the following lines at the beginning of the instrument definition:

  ; Ensures that a MIDI-activated instrument
  ; will have a positive p3 field.
  mididefault 60, p3 
  ; Puts MIDI key translated to cycles per
  ; second into p4, and MIDI velocity into p5
  midinoteoncps p4, p5 
              

Obviously, midinoteoncps could be changed to midinoteonoct or any of the other options, and the choice of p-fields is arbitrary.