OK - my web-page skills are as bad as you'll find, but it's the information that matters, right?
I've just posted a simple webpage detailing the pinouts necessary to fabricate your own Miracle Piano cable, for either the NES or the SNES system.
You'll find the page here:
http://64.81.193.244/miraclepiano/mi...ianocables.htm
If any of you spot any mistakes, please let me know and I'll fix it up.