Technically this isn't minimal, but it's really something most people will want.

After discussing with Ping, changed the format of the color correction command to use a MIDI-style SysEx command in OPC.

The server now works end-to-end, yay.

The firmware is feature-complete now, and this will save folks the trouble of downloading a huge toolchain. Plus I like to keep tabs on the quality of the assembly output :)