Today I have been working on tuning the Sega Genesis. I tuned it by ear, because the values given in the data sheet are not correct at all.
I have also made a small application called the genM Sound Editor that allows direct control of almost all synthesis parameters of the Genesis / Megadrive's YM2612 via MIDI CC messages. It features a 16-preset bank function, where instrument settings can be saved. Bank files can then be written to hard disk. The current preset per voice can also be loaded via sending MIDI CC messages to the application, allowing for a distinction between sequencing MIDI data and controlling instrument settings.
Here is a screen shot of the application: