as richard said ya I am working on replicating instruments, the tool is in Python and hopefully within a week or so it’ll be ready. It directly maps MIDI’s 128 melodic instruments and 61 drums to actual MakeCode Arcade Song instruments (1:1) I hand-wrote (ok yeah with a bit of help from AI lol, but i did the final approval), and I did my best to replicate them - they’re…decent I guess. You’ll see then.
I also saw this, by @Kikketer, which looks relevant to what you’re doing: