Noise Engineering
Type
Quad octave switch/mult
Size
4HP Eurorack
Depth
.8 Inches
Power
2x5 Eurorack
+12 mA
40mA
-12 mA
40mA
Quant Gemi
Quad octave switch and mult
Overview
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 together so the same sequence can be split up to 4
ways and transposed separately.
Etymology
Quant -- from Latin quantus: “how many”
Gemi -- from Latin gemino: “to pair or double”
“Multiple doubling”
Input & output voltages
QG is designed to work with the widest range of voltages possible, so anything within -8v to +8v
should work fine, if you really need a 16-octave melody in your patch somewhere.
1
Power
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 -12v and
each pin on the power header is plugged into the connector on the
ribbon. Make sure no pins are overhanging the connector.
Line up the red stripe on the ribbon cable so that it matches the
white stripe and/or -12v 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.
Warranty
Noise Engineering backs all our products with a product warranty: we guarantee our products to be free
from manufacturing defects (materials or workmanship) for one year from the date of the original retail
purchase (receipt or invoice required). The cost of shipping to Noise Engineering is paid by the user.
Modules requiring warranty repair will either be repaired or replaced at Noise Engineering's discretion. If
you believe you have a product that has a defect that is out of warranty, please contact us.
This warranty does not cover damage due to improper handling, storage, use, or abuse, modifications, or
improper power or other voltage application.
2
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 QG 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 1:
Patch a pitch sequencer (like Mimetic Digitalis) to QG’s first input.
Patch the output to an oscillator. Use the first switch to transpose the
sequence.
Patch 2:
QG 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 QG’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
QG’s transposition to change timbre in a subtractive patch.
Patch 3:
Using a precision adder like Quantus Pax, QG can be used to transpose
multiple sequences. Take the outputs of QP and route them to channels
1-4 on QG to transpose them separately. Conversely, patch an output of
QG to one of QP’s xpose inputs to transpose multiple sequences at once.
Quant
Gemi
2
0 +1 +2
4
1
2
3
4
In
1
3
Out
Design Notes
The QG was a pretty simple design dreamed up when we decided to make the QP and several other
modules that we have in the pipeline. 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!
3
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