To follow-on to Fernando's response, I originally used Leland Smith's SCORE program (the old SCORE, not the manuscript program originally named MS, but renamed to Score later), with Mus10 to turn the note list into sound. Then the Samson box came along and I used Pla for awhile with Sambox (the program that turned the note list into a synthesizer command stream). Later I got into the habit of writing a different program for each piece, or even writing the note lists by hand (Phrygians and various sound-file based pieces). CLM and Snd came still later, but by then I had somehow become a programmer which was a much easier life than composition. I did port most the old pieces to that environment. A major unanticipated problem was hearing loss in old age which makes it nearly impossible to check that I'm hearing what others hear.