images via
this auction
"For sale an super- rare- impossible- to- find Moog Song Producer for the Commodore 64. Pratically it is a Midi/Triggering interface which uses the Commodore 64 as its DAW. It comes with original package, software and diskette, plus alot of tech notes (yeah .. very uber-vintage feel !) The pictures below show the MSP for sale and those are real screen pics of the beast at work. The C64 in the pictures is NOT included in the auction.

Lots of geeky info out there if you Google "Moog Song Producer" (click
here for results) without mentioning all the C64 blogs."
Update: I've updated the flickr shots with larger ones.