A new version from the NES emulator HDNes has been released.
Quote:
Update 27-8-2013:
1. Reduced the slow down of capturing the screen.
2. Added the audio pack function. Currently I know how to make one for SMB only. (It can also be used for adding cheat!)
Update 16-8-2013:
1. Fixed HD pack for 16 pixel high sprites.
2. Fixed DMC channel.
3. Implemented grayscale function.