The Roll Music Valvop, or RMS-MC5 to give it's official title, is an optical compressor for the 500 Series format. The Roll Music Valvop is designed to be a smooth, musical sounding compressor in the mould of classic units like the Universal Audio LA2A. Smooth, rich and warm this compressor will be at home in any 500 Series rack. Roll Music Valvop Overview: • Fits in any 500 Series compatible rack or psu. • All tube, transformer coupled circuit design • Threshold control pot • Stepped make-up gain • PDR Mode. Program Dependent Release, for allowing transient detail and smooth compression of longer program material. • LED gain reduction indicator