Is there a way to attach some userdata onto a note for midi items?
For example, if I want to store some extra strings for a note, is there an action/extension/API function to do that? I noticed that there is a midi_message[3] in MIDI_event_t struct not used by reaper, but if I try to change the size of MIDI_event_t to 4 and add some flags to midi_message[3], the midi editor doesn't take it as a valid note anymore...
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