VGM #1 (YM2612 + PSG + NES APU + NES APU):

That 68 6C does not follow VGM specs. I'm unsure if the 68 command makes sense for the NES chip. If I had a choice in the matter, I'd much rather only see a 67 command here. But either way, the second byte is incorrect and should be a 66 for compatibility.

I also believe the third byte of 87 should be 07.

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VGM #2 (YM2612 + PSG + OKIM6258 + OKIM6258):

Why are there OKIM6295 commands in here? I am currently accounting for this in other software, but it'd be nice if it was instead using the OKIM6258 commands like is used in other places in the same file: