VCO1+VCO2 (Sawtooth) with Pitch Control; VCF with Cutoff and Peak Control</br>X-Mod circuit borrowed from the classic Korg Mono/Poly</br>Ribbon Keyboard with Scale Select: Major?? Minor?? Chromatic?? Off</br>Original MS-20 Filter with aux input</br>Built-in speaker?? battery power</br></br>Product Description</br></br>Dual Oscillator Analog Pocket Synth - Korg's dual-oscillator Monotron DUO fits in your pocket?? yet delivers enormous analog sound! Equipped with a built-in speaker and battery operation?? Monotron DUO i