399 EUR / Out of stock.


The tELHARMONIC is a Multi-Voice, Multi-Algorithm synthesizer module named for the music hall considered by some to be the location of the first electronic music concerts. It was coded by Tom Erbe with the goal of presenting three historically important pioneering electronic tone generation techniques less often implemented within the modular synthesizer.

The tELHARMONIC's roots go back further than the advent of electronic music, as it also takes a new approach to handling music theory in the modular context. TONIC, INTERVAL, DEGREE and D-GATE, allow for patch-programming of complex chord progressions, scales, melodies and playing styles. This Voltage Controlled Music Theory guides the Algorithms in a unified way, whereas CENTROID, FLUX and H-LOCK sculpt the timbre of each Algorithm uniquely, allowing for complex sounds to be created around a unified melodic structure and pattern.

  • 3 Voice Additive Harmonic synthesis inspired by Thaddeus Cahill's Telharmonium, 1897

  • Noise synthesis inspired by early computer music piece "Analog 1: Noise Study" by James Tenney, 1961

  • 3 Voice Phase Modulation synthesis inspired by early commercial digital synthesis, 1980's

  • CENTROID, FLUX and H-LOCK animate each Algorithm uniquely

  • All Algorithms available simultaneously at their respective outputs

  • 6 octaves of continuous 1V/ Octave pitch control

  • 4 octaves of quantized pitch control

  • Voltage Controlled Music Theory

  • DEGREE Modulation able to be synchronized by clock or gate via D-Gate input

  • Gate Out completes the conversation between tELHARMONIC and rest of system!

  • Utilizes High performance DSP hardware with 24bit, 48kHz codec, 32 bit floating point processing


The three tELHARMONIC algorithms are:

  • N = Noise. Digital, tunable noise whihc passes thru a fliter and shares the Tonic and Degree parameters with the other algorithms.
  • H = Harmonic. 3-voice additive synthesizer. Tonic controls fundamental pitch of all three oscillators,Interval detunes them, from unisono over 5ths, octaves to triads. Degree places the chord in a scale. With each chord change a gate is generated. Selected harmonics can be frozen with the Lock function and remain static, similar to formants, and aren't affected by the filter.
  • P = Phase modulation. Generates very wide PM sounds and the filter has strong effect. Especially in combination with the phase modulation the FM input creates deep, hovering jet sounds.
  • Said filter has parameter with the unusual names Centroid and Flux.


    The module utilizes high performance DSP hardware with 24bit, 48kHz codec and 32 bit floating point processing


    main section:
    CV inputs: tonic, interval, degree, FM
    D-Gate input
    gate output
    voice outputs: N out, H out, P out

    Centroid section:
    H-Lock gate in, Centroid CV in, Flux CV in


    3U Eurorack module, 14HP wide, 30mm deep
    power consumption: 130mA @ +12V and 10mA -12V