Comment by bitwize
A lot of PC games worked this way. Nintendo games even temporarily dropped music voices (typically preferring the second square wave voice, then the first) to play sound effects. If you found it too distracting, presumably the music could be muted.
> Nintendo games even temporarily dropped music voices (typically preferring the second square wave voice, then the first) to play sound effects.
This even happened on the SNES. A few Square games like Chrono Trigger and Final Fantasy 6 have tracks that are noticeably missing a music channel when playing sound effects. It wasn't totally necessary to use all the channels, but they were very adamant about their music quality.