On this page: http://audio.gadgetfactory.net/index.php?n=Main.YM2149MIDISynthesizer there is this quote: "There is open source VHDL for NES, Atari 2600, SoundBlaster FM synth, and other sound chips that is available." I have found HDL for NES and Atari 2600, haven't been able to find any FM chips. Anybody have a link?