doepfer-a-115

Doepfer A-115 Audio Divider

Four sub-octave square wave frequency divider with mix output

8 HP Eurorack module

The A-115 Audio Divider is a four-way frequency divider that takes an input signal and produces four sub-octave square waves at F/2, F/4, F/8, and F/16 of the original frequency. It sums the original and all four sub-octaves into a single mix output with individual level attenuators for each, making it a powerful tool for adding deep bass content, organ-like harmonics, and complex waveforms to any audio signal. Any non-square input waveform is first converted to a square wave via a Schmitt Trigger before division, giving the module a distinctly digital, buzzy character.

Features

  • Four sub-octave outputs: F/2 (first sub-octave), F/4 (second), F/8 (third), F/16 (fourth)
  • Schmitt Trigger input stage converts any waveform to square wave before division
  • All sub-octave outputs are true square waves regardless of input waveform type
  • Individual attenuators for original signal and each of the four sub-octaves
  • Summed mix output combining original and all active sub-octaves
  • Works with external audio sources via preamplifier module such as A-119

Controls & Jacks (14)

  • Audio In— Attenuator controlling the amount of the original input signal present in the mix output
  • F/8 Level— Attenuator controlling the amount of the fourth sub-octave (F/16) present in the mix output
  • F/2 Level— Attenuator controlling the amount of the second sub-octave (F/4) present in the mix output
  • F/4 Level— Attenuator controlling the amount of the third sub-octave (F/8) present in the mix output
  • Orig.— Attenuator controlling the amount of the original input signal present in the mix output
  • F/16 Level— Mix output containing the original signal and all four sub-octaves at levels set by the attenuators.
  • Audio Out— Signal input for frequency division. Accepts any waveform but converts to square wave before dividing.
  • Original Level— Attenuator controlling the amount of the first sub-octave (F/2) present in the mix output
  • F/2— Attenuator controlling the amount of the first sub-octave (F/2) present in the mix output
  • F/4— Attenuator controlling the amount of the second sub-octave (F/4) present in the mix output
  • F/8— Attenuator controlling the amount of the third sub-octave (F/8) present in the mix output
  • F/16— Attenuator controlling the amount of the fourth sub-octave (F/16) present in the mix output
  • In— Signal input for frequency division. Accepts any waveform but converts to square wave before dividing.
  • Out— Mix output containing the original signal and all four sub-octaves at levels set by the attenuators.

How-To Guides

  • Sub-Bass Octave Doubling
  • Organ-Like Harmonic Stack
  • Complex Waveform from Square Wave
  • LFO-Modulated Sub-Octave Blend
  • External Monophonic Audio Sub-Octave
  • Deep Sub-Bass Drone
  • Sawtooth Squaring and Sub-Octave Layering
  • Rhythmic Sub-Octave Gating
  • Generative Sub-Octave Morphing

Explore the interactive A-115 Audio Divider panel on BleepDex — tap any control to learn what it does.

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