There was a series of racks which were pretty much the same but for the lengh of memory and variations on the sample/trigger function. They all had knobs for delay time (one real-time variable knob, the range of which was determined by four buttons), speed, width, sample-hold, mix, feedback, input & output. They were the RDS 1900 (1.9 sec) and the rest were also named by how much memory they had - the RDS 2100 or something, 3600 or something, and 7600 or something. Then the RDS 8000 Time Machine came out which was the same deal with a different case and a full 8 seconds. I may have documentation somewhere if anyone wants to see it, though how to transmit it I'm not sure... By the way these are all very Frissel-like per that earlier topic... (And there were less fancy footpedal versions minus the speed and width controls, I think, and fewer input/output options...I had a two-second but it died a painful feedback-soaked electronic death...) I have the 1900 and 8000 and love them dearly. My first 1900 was stolen and it took me years to find another - When I got one back I felt such a deep sense of release I couldn't believe how much I'd missed it (loving gadgets is fun but bad for you when they go out of production so fast...setting myself up for a life of loss!) Pete PS - Does anyone know the resolution of the delay on those things? Is it some random bit size and sample rate that one might not expect? I've always wondered...