A-115 Audio Divider

A-115 Audio Divider


Creates up to four square wave suboctaves from the incoming audio signal. Separate controls for the original frequency, 1/2 frequency (1st sub octave), 1/4, 1/8 and 1/16.



Available on backorder

Product Description

Module A-115 (DIVIDER) is a four-way frequency divider. The frequency of a signal at the input is halved (half frequency = first sub-octave), quartered (1/4 frequency = second sub-octave), and so on. In this way, the DIVIDER produces four sub-octaves (F/2 down to F/16). At the output, the A-115 produces a summed mix of the original and the four sub-octaves. There are attenuators to control the amount (ie. Amplitude) of the original signal and each of the sub-octaves. Bear in mind that the sub-octaves output by the A-115 are all true square waves. If you put, eg., a sawtooth into the Divider, it changes it into a square wave before the frequency division takes place (using the SchmittTrigger system, if you’re interested). At the output, therefore, there are always four square waves and the original signal available.

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  1. (verified owner):

    The Doepfer A-115 Audio Divider is an extremely useful module for the production of frequency division; but not only this. The A-115 can be used to control oscillator sound sources for mini four-note sequences. The A-115 produces four sub-octaves of a signal source fed into it. The output is a summed mix of the original signal, plus the derived sub-octaves. The mixed output is always a composite of the square waves derived from the original signal. The f/2, f/4, f/8 and f/16 attenuators control the mix of the individual sub-harmonics. As well as creating square wave sub-octaves of whatever signal is inputted into the A-115, and indeed the module can be used this way for special frequency generation effects, the A-115 can be used to create complex square wave signals that can drive the CV or FM inputs of oscillators and filters to create sequences. The square wave output from a VCO or LFO can be fed into the A-115 input. The frequency division controls are adjusted and the composite square wave mix is fed into the 1 volt per octave input of an oscillator. The frequency of the input source determines the overall main frequency combination that controls a second oscillator. As well as simple sequences being produced, by tuning the controlling oscillator into the audio spectrum, very interesting vibrational and almost “granular synthesis” effects can be produced. Audio frequency division controlling the pitch of another oscillator can result in the production of evolving tone textures and vibrating textures that can be further enhanced by processing the final sound by a Doepfer phaser module and mild spring reverb. More complex combinations can include multing the frequency-divided square wave, and feeding the 1 volt per octave inputs of multiple oscillators tuned to different frequency intervals. The various oscillator (voltage-controlled by the A-115) outputs can then be mixed to create very organic chordal resonating vibrational textures. In this way, the A-115 is used to produce frequency determined combinations and sequences as a CV source, rather than a straight signal processor. At LFO frequencies, the A-115 can create haunting and ambient sequences. Here, the frequency division attenuators are adjusted until the desired CV effect is achieved upon an oscillator sound source. The output may be ring-modulated by another oscillator and treated by a spring reverb to add a surreal quality to the LFo sequence. The Doepfer A-115 is an extremely flexible and accessible module. By using it as a CV source, one can almost “play” the module by adjusting the frequency dividers in real time. Synchronised LFO patterns can be accomplished by using a very stable square wave input to the A-115, then overdubbing or multi-tracking several slow sequences in synchronistion to craete complex and pseudo-polyphonic results.

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