Ribbon controller keyboard with Scale Select. Original Analog (VCF) Filter taken from the classic MS-10 & MS-20. Aux input jack lets you apply filter to any audio source. Built-in speaker and battery power for Go Anywhere Analog sound. Headphone jack for private use. Dual Oscillator / X-Mod Design: Offering two oscillators, the monotron DUO adds an extra dimension, delivering an even more extreme sound. 

Tune the oscillators in unison for a rich, thick, analog tone. Tune them in intervals for classic soloing sounds and generating new effects. The X-MOD (cross modulation) circuit taken from Korg's classic Mono/Poly can introduce a mild or razor-sharp edge to the overall sound; everything from a rich vibrato to extreme metallic sounds reminiscent of an FM synth.

Enhanced Ribbon Controller Keyboard: The monotron DUO's ribbon controller keyboard now features the familiar Scale function used on the KAOSSILATOR. You can use this button to select one of four scales: Chromatic, Major, Minor, or Off. Choose the Chromatic scale to play precise pitches as on a piano, or choose Major or Minor to generate musically coherent phrases by simply sliding your finger around on the keyboard.