Erica Synths Intros Fusion Modulator, New EMS Synthi Inspired Analog Modulation Source For Eurorack

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Erica Synths’ Fusion Modulator is a complex analog modulation source including Synthi inspired envelopes, VCA, noise generator, and sample & hold. 

Erica Synths has not only expanded its Fusion module series today with a new filter (VCF3) but also with a new complex modulation module. Fusion Modulator is a multi-functional analog modulation source that offers three functions: two EMS Synthi functionality inspired looping envelopes, VCA, noise generator, and sample & hold. Like in the original synth, the envelopes can be used as regular AD envelopes but also in combination with a gate that can be turned on via the ON/OFF controls.

On is like a hold and with the OFF control, you can adjust the space before the next envelope begins. If you manipulate these 4 controls, you can create very interesting looping envelopes, pulses, and LFOs. Thanks to an additional BP bipolar output (-5v to +5v), you can use the envelopes also better as LFOs. Further, it includes an EOC (End Of Cycle) output which sends out +5v

Erica Synths Fusion Modulator

VCA, S&H & Noise Generator

Fusion Modulator also includes a built-in VCA for either audio or CV signals. The VCA is here normalled to the bipolar output of the left envelope generator. If you don’t patch the input, the output is the LFO signal. Also onboard is a sample & hold generator that can be controlled via two knobs: rate & CV input level. By default, it is normalled to the internal noise generator but the module allows you to patch a different signal into it via the CV input socket. The rate of the S&H can also be controlled via an external clock.

The last function of the FM is a white noise generator with matching output. Nice is here that it also includes an S&H+BP output which combines the S&H with the output of the envelope generator.


  • Full analog design
  • Two looping envelope generators with Attack, On, Decay and Off time control
  • CV control over Decay time
  • Simultaneous unipolar (0V-10V) and bipolar (-5V – +5V) envelope outputs
  • Manual trigger button
  • End of Cycle output
  • VCA with the offset control
  • Zener diode-based white noise source
  • Sample&Hold circuit with internal and external clock source
  • Attack time 6ms – 850ms
  • On-time  0-1,5s
  • Decay time 16ms – 2s
  • Off time 14ms – 1,3s
  • Sustain level +10V

At first glance, the Fusion Modulator is an exciting modulation module that fits to many modular systems. According to the developer, it works great with drone and experimental music.

Erica Synths Fusion Modulator is available now for 310€ (+21% VAT for individual customers in EU without EU VAT registration number + shipping).

More information here: ES

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