Whoa, you both are cool guys, it's not a big deal. I had someone give me hell for posting a schematic for a pc engine s-video mod, I just rolled my eyes and moved on with life. Even on real famicoms the audio mixing circuits were changed between different pcb revisions. There really is no "perfect" or ultimate version it's all preference. I'm so glad I have a a switch on my system for two audio circuit options because I find most games sound perfect on one or the other (especially for stuff that uses audio upgrade chips).