If youre smart and you want to adda level

you can download the source code here: https://github.com/merissler/beatjam

use midididi to use it create a level folder from a midi file

edit the CSV and JSON and then use mididididi to compile it to a big JSON file

put your audio track in the beatjam/assets folder and put the name in the JSON

run beatjam with the generated JSON file as the first argument

have fun its kinda crusty I know but you'll figure it out maybe ;)