There is a post up on Sonic State's The Gas Station dicussion Raymond Scott. Who was Raymond Scott? Ever watch Bugs Bunny? : ) Title link takes you to everything you might want to know.
Raymond Scott's Wall of Sound, an electro-mechanical sequencer designed & built by Raymond Scott, 1950s (New York)
Devin sent me a link to his site on the Yamaha PSS-570, yet another home keyboard you might dismiss at the local yard sale or pawn shop. The interesting thing about it is that it has a digital synthesizer button that lets you tweak the sound with five sliders. Interesting. Title link takes you to the site with more info, pictures and an audio clip. Thanks Devin! : )
from left to right: Casio VZ-1, Teisco 60F, Korg ER-1, Yamaha DX200, Casio CZ-3000, Elektron Machinedrum Userwave, Elektron Sidstation, Nord Modular, Roland TR-707, Korg MS-2000, Yamaha CS-15, Roland SH-09. Not in pic: Future Retro 777, DSI Evolver.