One such gadget was the Sony CFS-C7 Chord Machine Boombox Portable Cassette Tape Recorder, released in 1982 and only in Japan. Groove to the beat of your own synthesized drum thingy.

The pinnacle model of Sony's broadcast equipment line, the BVU-950 plays high-band, low-band, and SP U-Matic tapes. The machine can accommodate an internal time-base corrector board, with optional ...