This is the initial model created by PISUKE (a chick). Serial number #0198 The K&R Groove Comp is a high-quality bass effect pedal with LEVEL, SUSTAIN, and ATTACK adjustment knobs. - Model Name: Groove Comp - Brand Name: K&R - Adjustment Knobs: LEVEL, SUSTAIN, ATTACK - Output Terminals: OUTPUT - Input Terminals: INPUT - Country of Manufacture: MADE IN JAPAN - Builder: FX builder PISUKE - Serial Number: #0198 Thank you for viewing.