This pedal is based on the Dan Armstrong Orange Crush. As it uses a photocoupler for compression, it has little distortion and a very natural release. Currently, it's rarely seen on the used market, but a new one costs around 25,000 yen at Soundhouse. I'm selling it because I have several compressors, but many "natural" compressors are actually just Dynacomp-inspired circuits that sound "paco-paco" (a percussive, artificial sound). If you're looking for a truly natural compressor, I think it's worth trying.