An effector with LEVEL, TONE, and FAT controls. - Brand: Providence - Model Name: Sonic Drive SDR-4 - Controls: LEVEL, TONE, FAT - Terminals: IN, OUT - Switch: Footswitch It was extremely useful for copying BOOWY and COMPLEX. I am selling it because I started playing different music and no longer use it. There are some scratches. I used it once in a live performance. Operation has been confirmed. It sounds really good. If you're copying BOOWY or COMPLEX, I think this one is closer to the original Sonic Drive than the SDR-5. Please note that this is a used item, so no claims and no returns are accepted. Thank you for looking.