Built on the success of the K3020 Dual VCO, the K3021 Master VCO offers a single-channel oscillator based on this famous design. Completely redesigned to replace now hard-to-find parts, the K3021 uses a complete new triangle core design based on discrete transistors for an amazing tone and excellent stability. Useful as both your main pitch oscillator and as a complex low-frequency signal source (LFO), the K3021 Master VCO is a workhorse module that is great for any system.

One of the features that makes the K3021 special is its use of complex waveshapers and pulse width modulation circuits to create unique timbres. You can select between sine, triangle and ramp waveforms for the WAVE section. These waves then feed into the triple pulse width modulator to create very rich pulse waves that have a much more lively character than simple single-channel PWM. Choose from one of three PULSE output combinations for unique variations.

The BLEND and PULSE outputs can be used independently, or can be combined through the use of the ultralow distortion blend section. Smoothly fade between the WAVE and PULSE waveforms either manually or with voltage control. By using the blend circuit (especially with the LFO mode engaged) very complex modulation waveforms can be created easily.