@palomakop there's also SamplerBox that is actually preinstalled on it, but isn't accessible from anywhere in the UI. I don't use it a lot, but it was fun to check that GS can handle midi controllers https://forum.clockworkpi.com/t/midi-controller-usb-synth-speaker/1173
@palomakop and of course there are roms that you can run with emulators. lsdj and nanoloop for gb, music 2000 for psx, ikinari musician for nes