I'm really not sure where the icon problem is coming from, but I will try to track it down.
The sound problem should only be present in some of the GameBoy and NES titles due to the performance. I am working on some new ideas to speed things up and eliminate this problem. I don't want to have to sacrifice the frame rate (like SmartNES) in order to run at "full speed".
I think you're right about not sacrificing the frame rate. Your framerate is what makes your emulator better than others. I hope you can fix the sound problems cuz then your emulator will surely be worth the money.
Ohw gnuboy runs at half your speed and the sound is also crap, so your emulator is better already
Good luck coding... I'll check this forum regularly to see if you made a update to fix the icon problem.