If you need anything tested I would be more then happy to help. I have a Mega SG, Sega Genesis Model 2, and I'm picking up a Mega Drive Model 1 very soon.
Thanks very much! My Everdrive has finally arrived, and I fixed a 9 month old bug in music playback which I didn't know existed (only broken on real hardware). I also added in the controls as you suggested, and you're right, it's MUCH better, thanks! I have a Model 1 as well, but annoyingly it's only PAL.
I'm waiting on some MIDI files as I need to convert the music to FM, but after that I'll be putting up Release Candidate 2.