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FMco
FMco
1 / of 2

FMco:

Compact FM Synth Voice

ALM045 Buy Now (In Stock)

The FMco is a compact FM synthesis based VCO and voice. It features our own original 2-operator FM synthesis DSP implementation inspired by our ‘Akemie’ modules but tuned for more immediate use and a more modern sound.

It includes both manual and voltage control over FM Index, Ratio and a selection of classic operator waveforms for a wide palette of FM sounds from a simple set of controls. A built-in decay envelope is routed to both FM depth and output level, allowing the FMco to function as a full synth voice when triggered. The FMco also includes CV-controlled four-voice chords, an encoder-based tuning system for easy accurate pitch control, and a stereo-widened output, delivering a large amount of FM synthesis all in just 8HP.

Feature List

  • 2 Operator FM synthesizer voice with direct and voltage controlled parameters.
  • Easy, quick and accurate tuning via an encoder control.
  • FM Index offset with direct and CV control with attenuverter.
  • 8 Operator wave shapes with direct and CV control with attenuator.
  • Ratio control with lock switch for both free and precise operator ratios.
  • Trigger input for simple built in decay envelope internally connected to Index level and output VCA level.
  • Direct and voltage controlable chord mode with inversion and up to 4 voices.
  • Left and Right outputs with stereo widening effect.
  • USB-C for quick and easy ‘drag and drop’ firmware updates.
  • Skiff friendly with reverse power protection.
  • 2 Year Warranty
  • Made in England.

Technical Specifications

  • Supply: +12V 65mA / -12V 25mA
  • Size: 8HP
  • Depth: 32mm

Manual

The FMco PDF Manual is available for download.
Download

Overview

Pairs Well With →

Pamela's PRO Workout

Pamela's PRO Workout:
Clocking Modulator

ASQ-1

ASQ-1:
Multimode Sequencer

MFX

MFX:
Stereo Multi Effects Processor

Related Blog Posts →

  • VCV FMco

    VCV FMco

    A fully featured emulation of our new FMco module is now available in VCV Rack with the exact same 2-operator FM voice engine and features as its hardware counterpart.

    April 2, 2026
  • Announcing QUAID GIGASLOPE & FMco

    Announcing QUAID GIGASLOPE & FMco

    The QUAID GIGASLOPE is a four-channel multi-mode modulator, with each channel outputting a variable staged slope that can act as a complex envelope, flexible LFO, or step sequence.Each slope can contain up to 13 stages, which may be independent or overlap with other stages. Slopes can be triggered or run freely, with...

    March 20, 2026
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