Product Modular Synth

Introducing the Frequency Central Product voice module, which forms part of my forthcoming #100quidmodular concept.

Product is a full featured modular synthesiser which you can use without patching. Or you can use it as the heart of your modular system. Each component part is fully modular, but also features pre-patched normalised signal paths for fast set up of new and exciting sounds.

Product is a combination of three individual Frequency Central modules:

  • Raging Bull 3.0 VCF/VCA
  • System X Envelope


  • onboard LFO for PWM and FM
  • onboard noise source

Product features a motherboard on which all pots, switches and sockets are mounted, this is also where the pre-patched normalising happens. So the onboard LFO is available for both FM and PWM of the VCO. The three VCO waveforms are available at the three VCF signal inputs. 1V/oct input, LFO and ADSR are available at the three VCF signal inputs. By some cunning switching, the VCA can be operated by either ADSR or gate input, alternatively it can be set to drone position. Also available are signal outputs from the LFO and noise generator. All pre-patched connections can be broken simply by inserting a jack into the relevant socket.

To simplify the build process for DIYers, there are three daughterboards that plug into the Product motherboard: VCO daughterboard, VCF/VCA daughterboard, and ADSR/noise daughterboard. First you can build and calibrate the VCO daughterboard, plug it into the Product motherboard, get it running and have some fun with it. Then build the VCF/VCA daughterboard, and add it to you expanding modular synthesiser. Finally build the ADSR/noise daughterboard, and your synth is complete.

Product is available both fully assembled and as a PCB/panel set.

Product PCB set, and panel: £75 GBP

Build doc for DIYers: Product Build Doc

Product assembled module: £295 GBP

For orders and queries please contact me at:

[email protected]