Several of the almost-final MIDI files from the soundtrack I am currently converting (SNES to MIDI) seem to be okay, yet there are a few specific notes that do not seem to play any sound, and I'm having trouble determining why this is actually happening.
Firstly, I have isolated the channels/tracks in question and made audio recordings of the original vs the MIDI output. You can see that one channel of the stereo audio in the MIDI file (top half of the screen) is silent while it should be playing a sound, when compared with the original audio (bottom half), which is fairly similar across both stereo channels.
I've tried looking at the event lists for both tracks/(MIDI) channels in Sekaiju, but don't see anything that jumps out at me. I looked at the channel volumes and expression lines in MidiEditor, and also don't see anything that is obvious, though it's hard to determine what is what sometimes because of display issues with the GUI. Tracks 3 and 4 play the same notes, with one track delayed slightly, so the expression and volume lines are shifted between the two, but identical. I don't see anything in particular in Cakewalk either.
This issue happens because of limitations of the spc2mid converter, and can be heard while preparing the initial MIDI file for export, so my guess is there is an incorrect value being set for either expression, volume, or pan, but I can't determine which or where specifically it's happening.