Spencer Alves [backup] is a user on mastodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.

I've made a soundfont file containing only one instrument and I have no clue how to set a track from a midi file to this instrument

Spencer Alves [backup] @impiaaa

@Siphonay for future reference, what a daw calls an instrument, polyphone calls a preset, and that has a program number and a patch number, which ID's it to the synth