The Sir-Compre is an optical compressor pedal equipped with Photocells, and features a wide-range gain knob, a surprise unique to Friedman. This wide-range gain knob is the heart of the Sir-Compre, allowing you to shape a wide range of sounds from ultra-clean to semi-overdriven. This combination of compression and overdrive provides a wide range of great tones, from slightly rough compression to warm, compressed overdrive to a smooth, glossy, compressed drive tone, just like adding an extra channel to a clean amp. There is an internal trimmer that allows you to further increase the gain. Optical Compressor Pedal Controls: Volume, Treble, Gain, Compression, Tight True Bypass 18VDC Powered (Adapter powered only. DC9V adapter or 9V battery cannot be used.)・18V doubler cable included (※1) *1: Can be used with an isolated power supply (each power output port is completely independent). *2: There are external peripheral devices that can input DC9V and boost it to DC18V, but the inner diameter of the DC input port on Friedman products is narrow, so they may not fit.