B06XY41TFY Korg MONOTRONDUO 0-Key Dual Oscillator Analog Pocket Synthesizer

VCO1+VCO2 (Sawtooth) with Pitch Control; VCF with Cutoff and Peak Control
X-Mod circuit borrowed from the classic Korg Mono/Poly
Ribbon Keyboard with Scale Select: Major, Minor, Chromatic, Off
Original MS-20 Filter with aux input
Built-in speaker, battery power