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 earliest evidence of the Dimension D dates to photos taken on the Melt tour (officially titled "Tour of China 1984") in 1980. The Dimension D played a significant part in Peter's sound over subsequent solo efforts, in particular the Security and So albums.

For the most part, he relied on the Dimension D for enhancing his keyboards both onstage and in the studio, often coupled with a Deltalab DL-2 delay. Not only that, the Dimension D was also used on Peter's vocals in places on the So record, coupled with other devices like an AMS delay and digital reverb, a Quantec QRS and/or Lexicon reverb.

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.