I have been working a lot with Audio.
I have found using mp3 for music tracks to be suboptimal due to size getting out of control and also lack of things such as tempo adjustments during action changes etc.
My solution is midi files. I can upload samples then midi play them in a few hundred K.
You can hear what they sound like with the editor I wrote at
https://songforge.makegl.com
It works with my player with a bit of asset juggling but still needs a bit of help to be friendlier in here.
Do you think would be useful?