Prog started life as a project to provide procedural music generation for Quasidroid. That idea involved into creating an independent library that could be plugged into any game requiring responsive music. It's not really got as far as managing either of those goals yet, but somehow my test environment turned into a demonstrator of the exact opposite: procedural music driving a visualisation.

What it can do is export .mid and .wav files which you can do with as you please. I'm not making any claims for it producing great music, but I think it's got promise for game integration.

Unfortunately it's download only, because although a web browser version is possible, it can't generate audio of acceptable quality. But that allows the export functionality, and makes it sensible to include a reasonable soundfont (GeneralUser GS). Although you can do much better if you're prepared to download a few hunderd Mb of .sf2 and wait for Prog to load it (I've been using MuseScore General).

Note that the Windows version is untested.

Licensing

You are free to use any .mid export from Prog, or any graphics generated by the visualiser, for any commercial or non-commercial purpose (although acknowledgement would be appreciated). I also place no restrictions on use of captured .wav or audio recorded in any other way, but be aware of the licensing on the soundfont you are using.

Use in Your Project

The Prog code itself is MIT licensed and available for download and use at the source link below.