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.
