how did you get the samples to load?
I've done an emulator in Flash myself, and what limited for a long time was the gfx capabilities (fixed in Flash8 with BitmapData).
I reckon you have been faced with a similar problem but for sound...
How did you get the samples to load? how do you change the sample properties (i.e. pitch)? Does AS3 support load of binary data, and has better manipulation abilities?
Anyways, great work on this, bravo!