The Roland RE-201 Space Echo contains a tape drive - therefore Tape Echo - with three tape heads and a spring reverb. A mode switch activates the three tape heads and / or the spring reverb in fixed combinations. Mode 1 - 4 only echo, mode 5 - 11 echo + reverb and mode 12 only reverb. The reverb and echo volumes of the Roland RE-201 Space Echo can be adjusted separatly. With an intensity control you can adjust the feedback and herewith the number of echo repeats.
The Roland SDD-320 Dimension D was a 19" 2HE rack effect. It had 5 buttons. One red power switch and four buttons (numbered 1 to 4) which controlled the chorus sound. The four chorus buttons worked like radio buttons. But same smart muscians discovered that it was possible to push more than one button at once.