Roland SDD-320 Dimension D

The Roland SDD-320 Dimension D is an analog stereo rack-mounted chorus unit which was introduced by Roland in 1979. It can be used to synthesise a stereo image from a mono input source or further enhance a stereo sound with subtle chorusing and modulation. There is no pitch wavering produced, unlike most typical chorus/flanger units. The device has only four preset modes, and an output level display.

Peter Gabriel's Roland Dimension D
The Roland Dimension D is known for having been one of Peter's longtime go-to processing devices. The first time he was one was during the Melt tour (titled "Tour of China 1984") in 1980, when it was amongst his onstage rack units. He went on to use it on many of his subsequent solo albums and tours, mainly for processing synths (and sometimes vocals, supposedly). The So album especially leaned very heavily on the Dimension D chorus. For a long time, the Dimension D was coupled with a Deltalab DL-2 delay.

Mike Rutherford's Roland Dimension D
Mike Rutherford had a Dimension D as part of his onstage setup for the Duke tour: it's seen on top of a Yamaha PM-700 mixer, probably for adding spatial enhancement to the mixer output.

Dave Kerzner of Sound of Contact currently owns Mike's Dimension D.