I'll look into it, though I am not sure what I can do about it. When you play other pico8 games, are they also too loud for you?
Pico 8 sounds similar in volume to other things on the web like videos and the like to me. (I used YouTube to test and pico8 is actually a little quieter even at full volume then most YouTubers I checked against). As a matter of fact I have to turn my volume up a bit higher then normal to hear it sometimes compared to other games I play.
Pico8 doesn't have a good way to change volumes on sound without literally editing every note the sound effects produce. And like I said, it sounds just fine to my setup. So any volume adjusting would be a trial and error process of sending builds to someone who has the problem and then reajusting blind. Not likely to happen for this.
It would be great if someone else can confirm this observation about sound. I need to know if something is wrong with my own audio setup that I should be accounting for. There is still a lot more sound effects to do for the game.