Metasonix RK4 Oscillator/Filter Synthesizer any jack can be used

any jack can be used as the input allowing the remaining 3 jacks to be used as outputs

Eurorack (3U) form factor - 6HP width

and the VCA is used to control the dynamics of the input signal

The RK3 is optimized for general use in the professional modular synthesizer studio

Metasonix RK4 Oscillator/Filter Synthesizer any jack can be usedThe RK 4 is an 8hp Eurorack module replicating the basic function of the older R 54 "Supermodule". It is a vacuum tube (electronic valve) Wien bridge bandpass filter which can also be used as an oscillator. Tuning is effected by a dual element Vactrol optocoupler. TUNING tunes the circuit through it's full sweep range, from below 20Hz to more than 5kHz, manually. RESONANCE controls the resonance when used as a filter, and sets adjusts the waveform in