Paul, while I can appreciate that a lot of time and development has gone into Magic Engine, most emulators, including some of the most functional, are free, like Zsnes, Gens, etc... And given so many other emus are free, people sometimes don't want to have to pay for the one they can't find a good version for. Luckily, there are some quite nice free PCE emulators. Ootake, if you can get used to the poor interface, is quite a good emulator and does a better job of both ADPCM and PSG sound emulation than Magic Engine. That said, ME has a much better interface.