http://anyrecordings.com/jmttools/pnes-index.html
The P/Nes 8-Bit Monster is a synthesizer, or a Nintendorgan, inspired by the 2A03 chip used in the Nes sound architecture. It can produce authentic 8-bit sounds like the original Nes and other retro gaming systems or arcades, but it can also do much more with its expanded sound design. This is not just a basic simulation, this is a full blown synthesizer, my dream circuit-bent Nes.