Retro Instruments REVOLVER Stereo Vintage Style CompressorThe Retro Instruments REVOLVER A Revolution in a Rack. When you first put your ears to the Retro Instruments REVOLVER, you'll hear some very legendary compression, an ingredient many have kept secret. You will hear lively and vibrant dynamics, the same you have imagined for your own project. Now you will know the sound, it's as unmistakable as applesauce. Years of Development. As an experimental project in 2011, a few Retro Instruments REVOLVER's were