flickr by darklorddiscoRick Wakeman? :)
EVERYTHING SYNTH
THUMP



mOne
via sequencer.de
You can find the story here. I did a quick search on LM13600 here just to see what might come up. This one post on the KORG MS20 did. I did a search on LM13700 and this one post on the Salamandar synth came up. I'm curious what else used these chips.