Soundforce VCF/VCA 6, Eurorack Interpretation Of The Juno 60/106 Filter

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Soundforce VCF/VCA 6 brings the sound and character of the Roland Juno-60/106 Synthesizer filter into the Eurorack format 

Soundforce from the Netherlands is known to many for its boutique MIDI controllers. In addition to these, he also makes interesting Eurorack modules that are most heavily inspired by vintage synthesizers.

Now the developer has a new one at the start which will even be available in January. VCF/VCA 6 is a modern Eurorack interpretation of the iconic Juno 60/106 VCF, VCA, and HPF sections.

Soundforce VCF/VCA 6

Soundforce VCF/VCA 6

As all the original custom ICs are now obsolete and unavailable, Soundforce’s Juno-60/106 interpretation uses the popular Texas Instruments LM13700 dual OTA IC to recreate the VCF and VCA. All the passives needed have been taken over from the original schematics with some tweaks to adapt this design to the Eurorack format. The VCF/VCA 6 features VCF, VCA, and HPF sections.

The signal path starts with simple 2-input audio mixer. From here, it travels in a voltage-controlled lowpass filter (VCF) with a selection between 4 poles (24db/octave) or 2 poles (12db/octave). The filter cutoff can be modulated using the FM1 and FM2 CV inputs. A nice addition is the option to invert the polarity of FM1 using the toggle switch. Then, it has a V/oct input that can be used either to open/close the filter musically or to use it in self-oscillation as an oscillator source (8 octaves). You can also control the resonance with control voltage using the Q CV input. All CV inputs have also attenuators expect the VOCT input.


After the VCF comes to the VCA section that uses a vintage-style single OTA VCA. It has a manual slider control as well as a CV input for the VCA. Last but not least, there is a high-pass filter (HPF) that combines the Juno 60 and 106 characteristics using three fixed cutoff frequencies.

Position 0 will give you the bass boost from the 106, position 1 no filter at all. From position 2 to 4, it will cut progressively more bass and the cutoff frequencies are 225 Hz, 339Hz, and 720Hz. Soundforce has also added loudness drop compensation functionality. This avoids the usual input drop with a high-level of resonance. That’s a very handy feature.

Soundforce VCF/VCA 6 will be available in January for 289€ (incl. VAT) or 238€ outside of Europe.

More information here: Soundforce

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