The Doepfer A-156 is two simple yet useful quantizers in a small space!  Quantizers are used to round voltage to the nearest V/oct values, perfect for pairing with an unquantized sequencer or for creating generative patches!

Each quantizer has an optional trigger input (a sample and hold, for choosing when the quantizer activates.) and trigger out (that activates when notes changed, great for generative patches with free/loose tempo.  The second quantizer has the selectable scales of semitones, major, minor, or chords (major or minor 1 3 5 and 6/7, depending on switch settings.)  The first quantizer by default is always semitones but can be changed to follow the scale of the second quantizer, selectable by jumper.  Also features a common transpose input, which is unity mixed into each quantizer input for diatonic transposition!

Per Doepfer:

"Module A-156 is a Dual Control Voltage Quantizer. A quantizer converts a continous control voltage in the range 0...+10V into a stepped output voltage in the same voltage range (i.e. only certain voltages occur). Normally 1/12 V steps are used to obtain semitone steps. Quantizer 2 of the A-156 allows has more sophisticated quantizing modes like major scale (i.e. only voltages corresponding to the major scale), minor scale, major chord, minor chord, fundamental+fifth and addition of seventh or sixth when chords are selected. Only those voltages appear at the CV output which comply with the selection rule (e.g. minor chord with seventh). The mode setting of quantizer 2 is done with 3 switches (1-0-1 type with middle position). From the factory quantizer 1 is working in the semitone mode. But there is a jumper (J1) on the pc board that can be changed so that even quantizer 1 uses the same scale as quantizer 2. If the jumper J1 is in the lower position (factory setting) the positions of the toggle switches affect only the lower quantizer and the upper quantizer is working in the semitone mode. In the upper position of J1 the positions of the three toggle switches are also valid for the upper quantizer.

For each quantizer the following in/outputs are available:

• Control voltage input (CV In): The input for the contiuous voltage to be quantized
• Control voltage output (CV Out): The output of the quantized voltage
• Trigger input (Trig.In): If this jack is left open the quantizer is working permanently. If a rectangle voltage is applied quantisation happens only at the rising edge of the signal (e.g. from an LFO or MIDI-to-Sync interface). Thus the quantizing can be synchronized with other events.
• Trigger output (Trig.Out): Whenever a quantisation happens (i.e. a new voltage is generated at the CV Out) a positive pulse occurs at this output. It may be used to trigger an envelope generator (ADSR) or for triggering other modules (sequential switch A-151, trigger divider/sequencer A-160/161, trigger delay A-162, ...). If none of these functions are used the jack is left open.

On top of that the A-156 is provided with a common transpose CV input having an additive effect on both quantizers. This input is quantized in semitone steps. A typical application is the transposition of a sequence generated by the A-155 by a second control voltage (e.g. coming from the MIDI-CV interface A-190). When only the voltage applied to the Transpose input changes no new quantization take place. For a new quantization the voltage applied to the CV In of quantizer 1 or 2 has to change.

Typical applications:

• Quantizing the CV sequence generated by an A-155 (semitone, onyl major scale, only minor scale and so on)
• quantizing the voltage coming from the Trautonium Manual / Ribbon Controller A-198, Theremin A-178 or Light-to-CV module A-179 to get accurate semitones or major/minor scale tones
• arpeggio-like effects with LFO, random, noise, envelope generators as CV sources (for negative or symmetrical voltages an offset must be added, e.g. with the offset/attenuator module A-129-3, to obtain positive voltages for the A-156 input).

Specifications:

8hp

55mm depth

50ma @+12v

10ma @-12v