The code listing for henontune is too lengthy to print here, but it can be read on-line here. Improv can be used to create your own MIDI programming environment, including non-real-time applications.

I need a custom designed program, as all the ones I see online are either command-line only or software-synth. The Mozilla plugin doesn't work (at least for me), and XMMS has no MIDI option.The ...

As a sound server for Linux, Pipewire 1.4 addresses music production requirements with an extended JACK API and MIDI 2 and contains new codecs.