I am struggling to wrap my head around how the Music() and SFX() call functions work. I have a music track and some sfx calls that clash even though I have stipulated that the sfx calls only call on an unused channel. I have also tried to use the channel mask argument for Music() but can't seem to figure it out.

Basically a soundtrack plays while the game is running. Pressing a jump or collecting coins all trigger a sound effect that causes the backing soundtrack (Music()) to skip notes.

Could someone please maybe explain to me how I can have music AND call sound effects properly so they don't interrupt each other?

Nerdy Teachers has a good breakdown of channelmasks here: https://nerdyteachers.com/PICO-8/Guide/?MUSIC

Thanks. I will have a look at the link.