However if a channel already has a Program Change event then adding a new one at the beginning will have no effect because it is immediately overridden by the pre-existing one. If you want to change the instrument for such a channel then all you need to do is add a new Program Change event for this channel at the beginning of the track. Without any Program Change events at all, a channel will use program number (voice number) zero, which is an acoustic grand piano. The last of these will change the instrument assigned to a channel, and that is what you need to change or add. The MIDI package will do this for you, but the exact approach depends on the original contents of the midi file.Ī midi file consists of one or more tracks, and each track is a sequence of events on any of sixteen channels, such as Note Off, Note On, Program Change etc.
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