An old friend gave me a couple copies of Sheet Music Magazine that he picked up at a yard sale. They were dated 1978 and 1980. In the 1980 magazine there was a New Products section that featured the RMI DK-20, the latest and greatest arranger keyboard. http://matrixsynth.blogspot.com/2010/11/rmi-dk-20-digital-keyboard-synthesizer.html

Also on the same page was the MTI Auto-Orchestra. http://matrixsynth.blogspot.com/2009/04/vintage-mti-auto-orchestra-synthesizer.html

Some pretty amazing stuff for back then.

Gary