Jomox Mod FM – 8-Voice Eurorack FM Synthesizer

The Jomox Mod FM is a fully self-contained 8-voice FM synthesizer in Eurorack format. Combining a digital FM engine with true analog filters, VCAs, and modulation capabilities, the Mod FM bridges the gap between classic FM synthesis and analog warmth.

With 4 operators per voice2 LFOs/VCOs, and full multitimbrality, the Mod FM delivers everything from metallic FM tones to snappy techno percussion and lush, analog-style textures. Each voice is fully independent with its own CV/Gate inputs, dedicated output, analog filter, and VCA, making it one of the most flexible FM synths available in Eurorack.

Key Features

  • 8 voices, each fully multitimbral
  • 4 operators per voice with full modulation matrix (26 algorithms)
  • ADSR envelopes per operator, frequency modes (key-tracked or fixed Hz)
  • 2 LFOs per voice (64 waveforms), switchable into full audio-range VCOs
  • Dedicated analog filters per voice (SSI2140 – modern SSM2040 design)
    • 24 dB low-pass
    • 12 dB multimode LP/BP/HP with continuous crossfade (shape)
  • True analog VCAs per voice for snappy response
  • Metal Noise generator for extra percussive/experimental textures
  • FX engine: stereo reverb + 2x delay (syncable via MIDI clock; includes flanging-style micro delays)
  • Matrix interface with 16 endless encoders + dual OLED displays for fast editing

Connectivity & Control

  • CV/Gate per voice
  • CV modulation inputs for each operator
  • Dedicated outputs for each voice + stereo mix out (odd/even split)
  • MIDI I/O (TRS Type A) and USB-C (MIDI over USB)
  • Full storeability of sounds, including CV amounts
  • 128 presets + 118 multi sets (multi mode = independent voices with individual sounds)

Specifications

  • Sound Engine: Hybrid FM (digital operators + analog filters/VCAs)
  • Operators: 4 per voice, arranged in full modulation matrix
  • Algorithms: 26, derived from DX9 architecture
  • LFOs/VCOs: 2 per voice, 64 waveforms, switchable to audio range
  • Filters: SSI2140 per voice, 24 dB low-pass + 12 dB multimode
  • Envelopes: ADSR for operators + filters
  • FX: Stereo reverb, dual delay (MIDI-sync)
  • Displays: 2× 128×64 OLED
  • Presets: 128
  • Multis: 118
  • Power: +12V 370 mA / –12V 170 mA (≈ 6.5 W total)

Dimensions

  • Width: 56 HP (≈ 284 mm)
  • Height: 3U (≈ 129 mm)
  • Depth: 40 mm

This item is sold As-Described

This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.Learn More.

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  • ModFM
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