Fusion VCO v2

£329.00 (£274.17 ex VAT)

Stable AS3340-based analogue VCO with 3 simultaneously waveforms, transistor-based suboscillator, dual BBD-based detune function and controllable tube overdrive. Also features an external audio input!

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The Erica Synths Fusion VCO2 is a full analogue sound source with lots of distinct features.

The core of the module is highly stable AS3340-based VCO which offers three simultaneously available waveforms, along with a transistor-based suboscillator

It also features a detune function comprised of two BBD (“Bucket Brigade”) delay lines. These create a frequency shifter that is mixed back in with the principal oscillator in order to emulate two detuned VCOs. Tube crunch – distinct tube overdrive – is added on the top of the mix.

Furthermore, the AUDIO IN mixes an external audio signal with the principal oscillator which can result in a crazy sonic experience! The Erica Synths Fusion VCO2 is exactly what you need if you wish to get really low frequencies and have a sound that sets your modular system apart from the masses.


  • Full analogue design
  • Great tracking over 8 octave range
  • BBD-based detune function for thickening the sound
  • -1 oct transistor based suboscillator
  • Tube overdrive circuit
  • External audio input
  • VCO synchronization
  • Simultaneous waveform outputs

The Fusion VCO v2 received a glowing review from proaudio.de – “The Erica Synths Fusion VCO 2 offers a very wide range of sounds. If you simply need an oscillator without the specific tube sound, you have access to it via the triangle and pulse outputs. The Erica Synths Fusion VCO 2 is not a standard oscillator, but thanks to the two tube stages, it is in itself a module capable of diverse sound shaping. If you are looking for warm, fat or even heavily distorted sounds, you should definitely take a look at the Fusion VCO 2, because there is hardly any analogue oscillator available that offers so much of its own sound character and works both for long sustained and percussive sounds. Without question it is worth it in terms of both sound, functional possibilities and processing – Pro Audio

A note about power:

Please make sure your PSU has some power headroom before installing Fusion modules – especially multiple units.

All Fusion modules by default are configured to work with a regular Eurorack PSU. However, due to the fact that cold tube heaters have lower resistance, Fusion modules have a power consumption peak at startup, when power consumption increases for 1-2 seconds.

This is not a problem with linear PSUs that have power inertia, but you may find that the internal protection feature on switching PSUs temporarily turns off the power supply if there isn’t enough headroom to accommodate this additional power consumption. See below for further details.

Width: 14hp
Depth: 25mm
Power: 228mA @ +12V / 55mA @ -12V
(please allow for up to 315mA @ +12V / 63mA @ -12V during startup)