First, thank you for this very interesting project.

It does bring an alternative the the closed-source deflemask engine and GUI,
and it also includes a very capable engine for lots of chips, this is really nice !

As I see you are ready to bring more features to furnace, I think it would
be really cool to be able to use furnace engine (headlessly?) with MIDI input.

If volume, panning, vibrato etc were handled in MIDI and translated into
pseudo-deflemask commands, this would allow musicicans to compose songs
in any DAW, and to play them on simulated hardware, or to export them to .vgm format.

We can discuss and refine these different features, if you are interested in them.

Thanks !