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loprog / hiprog

The region plays when the MIDI program number is between loprog and hiprog. MIDI program numbers in the General MIDI spec ranged from 0 to 127 but were often displayed externally as 1 to 128. This uses the 0 to 127 range. Default is loprog=0 hiprog=127. By default, most DAWs seem to have the program number set to 0, so setting loprog higher than 0 without sending program change messages results in no sound.

loprog=0 hiprog=0
loprog=1 hiprog=1
loprog=10 hiprog=12