Here's the beat happening oscillator/electronic percussion unit from electrograve, a noise-based manufacturer from Osaka. - Model Name: beat happening - Output Terminals: OUTPUT - External Input: EXT. INPUT - Power: DC9V - Control Knobs: SENS, DECAY, SWEEP, DEPTH, RATE, MOD, WAVE - Accessories: Instruction manual, warranty, sticker It was used on an effects board, so Velcro is attached to the back, but overall it's in very good condition. It's a very interesting piece of equipment. Tapping the black pad on the front with your finger or fingernail allows you to use it as electronic percussion, and turning on the toggle switch on the side allows you to use it as an oscillator. Depending on the settings of the knobs and faders, you can change the sound from noise-based sounds to 80s-style electronic sounds, making it very interesting. Also, using the ext input, you can trigger sounds with the input sound. It seems the manufacturer is out of stock, and it's uncertain whether it will be re-produced, making it a rare piece of equipment that is rarely put up for sale. I really liked it, but I'm selling it to change my equipment.