[twax462]

No idea... how are you closing the emulator? force closing it might be causing it.. Try closing the emulator with its inbuilt mechanism. You'd probably have more success asking on the steam forums.

Thanks for the reply. I was asking here because I wasn't entirely sure whether the problem had anything to do with using the Steam Launcher but I think I've figured it out. I had previously just been using xpadder with Alt+F4 bound to one of the buttons of my xbox 360 controller. I switched from zsnes to snes9x though, giving me the ability to use Open GL. This allowed me to just use the Steam overlay and the home button on my controller to exit the emulator, which is one of the functionalities I was originally after anyway. It's working how I was hoping it would for the most part. When I hit the home button, it opens the Steam overlay giving me the option to quit the game. However, while the overlay is still up (meaning I haven't closed the game yet) the sounds of the game continue to run in the background at a reduced speed. I've chalked that up to the emulator being in the background and probably not receiving as much processing power.