Somewhere along the line of product development at 3M, we developed an 8-channel reproduce module. I think the customer was Irv Joel at A&R Recording in New York. The module was the same 5 1/4 height as the rest of our single-channel record/reproduce modules, but it was crammed with 8 reproduce cards and 8 line amplifiers. On the back panel were 8 output transformers, 8 head connectors and 8 XLR3 connectors. In the center of the module was a small VU meter (from Ron Newdoll) and a selector switch that connected the meter to any of the 8 outputs. The power supply was mounted externally on the floor of the recorder’s cabinet. In a way, this was probably the beginning of the product evolution that would eventually lead to the M56 compact 16-track recorder.

With Camarillo less than an hour away from Hollywood, we frequently would visit with customers regarding their requirements. I remember one of those meetings with Bruce Botnick at Sunset Sound. We were talking about 8-track machines since Wally’s 8-track was a frequent resident at Sunset before they bought their own machine. Bruce was discussing the process of overdubbing and he made the comment “I really don’t need a full 8-track recorder. I could get by with just one channel of record if I could move the record channel around. Just give me 1 selectable channel of record and 8 channels of playback and I will be happy.”
After the meeting, I began to think about what it would take to fill his wish. Having only one channel of record would save quite a bit of money and space. We had the 8-channel reproduce module described above, and all we would need would be one record module. The new part would be the head switching for the record side.

