via
this auction
"This is a very rare (in the uk) roland SPV-355 synth module. It can be used as a guitar synthesiser (or any other instrument), as a pitch to cv converter or as a 1v/oct analogue synth module. The synth has been compared to the promars in architecture, with one shape able VCO and a second mirrored but detunable VCO.
Read an appraisal by Chris carter of Chris and Cosey
here."