There are some games it seem, that have an overpowering channel a or b
One of these, is Micky And Minnie's Magical quest (First ever cartridge I played so it's the one I tested first) and upon testing it, the audio from A and B blasts over all the other effects, the jumping, damage sounds, everything gets fainter and fainter.
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My suggestion, is to add a volume slider per channel. Idk how hard that is, or if it's even possible, but it would probably fix the sound errors of the kind I described above.