The MS-50 is a keyboard less expander type module which is completely patchable. It uses the Korg Hz/V type of CV and Gate for controlling other synths such as the MS-20. The MS-20 alone is a monophonic, single VCO analog beast with fat rich sounds!! While an analog beast, the MS-50 offers more patchable ability than the other MS synths.
It also offers ring modulator, voltmeter and sample & hold functions. This has been used by well known artist such as The Chemical Brothers.