JOYO R Series high-gain distortion "CHOPPER-Z". It is probably a clone of the Horizon Apex Preamp. It has three output modes: OFF, Preamp, and Power amp, and can be used as a preamp even when plugged into the return. I felt it was very user-friendly because it also has a noise gate. Gain boost is also possible with the FAT BOOST switch. I have only used it at home (non-smoking, no pets). I am selling it because I am changing equipment. There are scratches on the back. The outer box is dented due to the impact during transportation. Please understand that returns are not accepted due to reasons such as not liking the sound. I will ship via Yu-Packet Plus. Thank you. #joyo #crunch #od #distortion #boss