Quant Gemi#

Quad octave switch and mult


Quant Gemi is a small transposition/split utility. Each channel can be used to transpose a sequence up 0, 1, or 2 octaves. The channels are also normalled so the same sequence(s) can be split up to 4 ways and transposed separately.

  • Type: Quad octave switch/mult
  • Size: 4HP Eurorack
  • Depth: 0.8 inch
  • Power: 2x5 Eurorack
  • +12 V: 40 mA
  • -12 V: 40 mA


Quant -- from Latin quantus: "how many"

Gemi -- from Latin gemino: "to pair or double"

"Multiple doubling"

Input & output voltages#

Quant Gemi is designed to work with the widest range of voltages possible, so anything within -8 V to 8 V should work fine, if you really need a 16-octave melody in your patch somewhere.


Power connector

To power your Noise Engineering module, turn off your case. Plug one end of your ribbon cable into your power board so that the red stripe on the ribbon cable is aligned to the side that says -12 V and each pin on the power header is plugged into the connector on the ribbon. Make sure no pins are overhanging the connector! If they are, unplug it and realign.

Line up the red stripe on the ribbon cable so that it matches the white stripe and/or -12 V indication on the board and plug in the connector.

Screw your module into your case before powering on the module. You risk bumping the module's PCB against something metallic and damaging it if it's not properly secured when powered on.

You should be good to go if you followed these instructions. Now go make some noise!

A final note. Some modules have other headers -- they may have a different number of pins or may say "not power". In general, unless a manual tells you otherwise, do not connect those to power.


Illustration of Quant Gemi's interface

Switches 1-4
Adds 0, 1, or 2 volts (octaves) to the input CV.
Inputs 1-4
CV inputs. These are normalled together so Quant Gemi can be used as a mult. Patching to a second input breaks the normal.
Outputs 1-4
CV outputs. Transposed sequence comes out here!

Patch tutorial#

Patch 1a
Patch a pitch sequencer (like Mimetic Digitalis) to Quant Gemi's first input. Patch the output to an oscillator. Use the first switch to transpose the sequence.
Patch 1b
Patch a second sequence from the pitch sequencer into input 3. You now have two outputs with the first sequence (1 & 2) and two with the second sequence (3 & 4). Transpose at will.
Patch 2
Quant Gemi can be used as a mult. Patch the additional outputs to other pitch CV destinations and use the switches to transpose each channel separately. This is useful for a number of things; route the same sequence to both pitch inputs of a complex oscillator like Loquelic Iteritas and use Quant Gemi's octave switches to change timbre. Similarly, patch one channel to an oscillator and one channel to a keytracking filter's 1v/8va input and use Quant Gemi's transposition to change timbre in a subtractive patch.
Patch 3
Using a precision adder like Quantus Pax, Quant Gemi can be used to transpose multiple sequences. Take the outputs of Quantas Pax and route them to channels 1-4 on Quant Gemi to transpose them separately. Conversely, patch an output of Quant Gemi to one of Quantas Pax's xpose inputs to transpose multiple sequences at once.

Design notes#

A visit with the wonderful Patrick Leonard inspired a whole line of products (#workinonit), including this one. When we decided to make the Quantus Pax, the Quant Gemi was an obvious complementary product. The schematic was pretty simple and we had a mockup pretty quickly. The first version was pretty spot on except for two things: we didn't think to normal the jacks, and the switches were not ideally laid out. We revised the hardware, making both of these changes, and voila!


We will repair or replace (at our discretion) any product that we manufactured as long as we are in business and are able to get the parts to do so. We aim to support modules that have been discontinued for as long as possible. This warranty does not apply to normal wear and tear, including art/panel wear, or any products that have been modified, abused, or misused. Our warranty is limited to manufacturing defects.

Warranty repairs/replacements are free. Repairs due to user modification or other damage are charged at an affordable rate. Customers are responsible for the cost of shipping to Noise Engineering for repair.

All returns must be coordinated through Noise Engineering; returns without a Return Authorization will be refused and returned to sender.

Please contact us if you think one of your modules needs a repair.