Ever since the e200, the hardware for the volume keys has been changed making it unusable in games.
EDIT: Parallax, saves are meant to be 136.8kb I think but sometimes your version (haven't tried latest but happened on previous so I assume still happens) creates bigger ones that seem not only to store the state of the game, but also the buttons that are pressed afterwards.
It seems to happen after saving and loading a lot, for example save sonic 2, go a bit further save again, go further til you die, reload, die again, load again and then it goes through the same process as before - going through the motions you did before you die (annoying). Saving it again as it does this stops the keys been virtually pressed like this.
I wouldn't mind that too much but a couple of my saves have become corrupted - a sonic 3 one of about 137.1kb which you load and it is just frozen, and a phantasy star online one which is a big bloated one, around 222kb which just makes the program quit when you load it. Anything you can do about this? Anyone else noticed it? I don't remember it happening on maxhs versions.
Posted below are a correct size, perfectly working sonic save, and the bloated phantasy star save. I've had a look in a hex editor for anything noticeably different but it's all random crap and I couldn't find anything. If you find a way of getting the ps save to load it would be good too as I hadn't backed it up for a while.
Anyways dude don't let that all get you down tis great work! Thanks a lot!
EDIT2: Would it be a lot of work to be able to get picodrive to accept megadrive games via the command line? If not, I think that would be a good idea, then you could use smart explorer to make .smds open with picodrive and put sonic2 eg in you start menu.
Feel free to shout me down if I'm pestering you too much for new features.
Jamma
EDIT3: (last one I promise

)Just tried the latest version and it autoloads your save, any chance you could make it so it doesn't again, or include an option? Coz i prefer it to do a normal boot up, for sonic etc.