Soundhaspriority wrote:

I copied this off r.a.m.p.s. : http://www.youtube.com/watch?v=5HyBm_6XryE

Look for the control room shot. It looks like two separate 1/4" tape
machines. I wonder if they were synced?

Already answered in r.a.p.

Probably Vortexions and not synched. They had AC mains driven synchronous
motors and besides the Vortexions appear to be mono types.

Graham