Instruments for a New Electric Music

Second Voice and Second Voice Deluxe


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The Second Voice is a fully analog harmonizer using a phase-locked loop harmony circuit along with fuzz and a dedicated suboctave circuit to create synthy, glitchy, harmonically rich tones.

The Second Voice was Infanem's second product and has evolved quickly in only two years. The newest standard Second Voice retains the PLL harmony circuit of previous models and adds an additional analog suboctave circuit, tone controls, external sustain/gate control, and a CV/Exp input controlling the Range knob.

The Second Voice Deluxe also adds footswitches to individually mute/activate the harmony and suboctave and replaces the simple tone controls of the standard version with voltage controlled -12dB/oct active resonant low pass filters. CV/Exp controls are include for control of each filter's cutoff frequency.


Separate volume knobs for Suboctave, Harmony, Fuzz, and Clean signals provide complete control over blending and levels.

Controls tracking and tone of the synthesized harmony. The best tracking will typically occur between 10 and 4 o'clock on the control, though the sweet spot is different for each harmony. At clockwise settings, the tone will have greater high-frequency harmonic content. Counterclockwise brings it more toward a bass synth sound. Of course, the uncontrollable parts of the travel are useful as well. At far left, most Harmonies will begin to glitch to subharmonics. Far right will glitch to upper harmonics.

Harmony selector switch-
Controls the interval of the synthesized harmony. Selectable Intervals:

  • One octave down (-12 semitones).
  • A perfect fifth shifted down one octave (-5 semitones).
  • A perfect fifth (+7 semitones).
  • An octave up (+12 semitones).
  • A perfect fifth shifted up one octave (+19 semitones).
  • Two octaves up (+24 semitones).

Controls the sustain of the fuzz, harmony, and suboctave. CCW yields more staccato sounds. CW yields longer sustain but, at highest settings, will also cause pickup hum and finger noise to activate the synths.

Tones (standard Second Voice only)-
Passive -6dB/oct low pass tone controls. CW is deep, dark, and bassy. CCW is bright and, at times, harsh.

Filter Freq, Resonance (Second Voice Deluxe only)-
Active -12dB/oct low pass filters. These have a fatter, more synth-like sound. Freq controls the cutoff, Resonance adds a peak at the cutoff frequency for a more pronounced filter sound, especially when sweeping with CV/Exp control of Freq.

Suboctave, Harmony footswitches (Second Voice Deluxe only)-
Allows the user to mute/activate the Harmony and Suboctave circuits for on-the-fly tone changes.


  • Input, output, and power jacks located across the top of the enclosure.
  • Uses standard 9VDC negative tip power. Current draw is approximately 100mA.
  • Range CV (all models) and Freq CV (x3 on Deluxe models) accept either 0-5VDC CV or passive expression pedals. When choosing expression pedals, I recommend Moog for the best balance of value, performance, and feel.

Tech details:

  • True bypass switching.
  • Internal voltage doubling increases headroom while using a standard power supply.
  • Standard Second Voices have black graphics on a white 1590BB enclosure (4.7 x3.7 in), screen printed in-house.
  • Second Voice Deluxes have black graphics on a hand polished 1790-sized enclosure (5.7x4.7 in), screen printed in-house.
  • Double sided, through-hole plated PCBs produced in Mulino, OR and assembled in-house using highest quality components. The Second Voice is an original design developed and built in Portland, OR.