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Shifting Inverting Signal Mingler
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Shifting Inverting Signal Mingler (SISM)
from 4ms Company
Eurorack Module User Manual
The Shifting Inverting Signal Mingler (SISM) is a 4-channel voltage manipulator that can scale, invert, attenuate,
shift (DC offset), mix, split, and slice your CV and audio signals.
Fourteen red and blue LEDs show exactly what each output jack is doing: red = negative voltage, blue = positive.
Each of the four channels are independent and have an input and output jack, a knob for attenuating/inverting
(Scale), a knob for applying positive or negative DC offset (Shift), and two LEDs.
Four jacks on the bottom combine the four channels in different ways. Mix is a straight mix of all four shifted inputs,
Switched Mix is a mix of all channels that have nothing plugged into the OUT jack, Positive Slice is the sum of all
output voltages greater than zero volts, and Negative Slice is the sum of all negative voltages. The SLICE jacks
can be used for sub-mixes, half-wave rectifying, “dirty panning”, and creating new CV signals from existing ones.
Each channel has a jumper to make the Scale knob uni-polar (no inverting, attenuate only). This is useful for mixing
audio instead of CV. Another jumper connection allows for a maximum of 2x gain. Headers allow for connections to
a QCD, QPLFO, VCA Matrix and other manufacturer's modules.
DOWNLOAD MOST RECENT MANUAL AT:
http://4mspedals.com/sism.php
Basic features:
•Four independent voltage processor channels and four mix/mingle outputs
•Each channel has:
◦INput jack
◦SCALE knob (from inverted unity, to zero, to unity). Center-detented.
◦SHIFT knob (adds/subtracts DC offset from -9.5V to +9.5V). Center-detented.
◦OUTput jack
◦Red and blue indicate positive and negative signal, respectively. Brighter means more voltage, LEDs
dimmer means less.
•MIX jack outputs sum of all channels
•MIX SWitch jack outputs sum of all channels with nothing plugged into their output jack
•+ SLICE jack outputs positive portion of mix (voltages greater than 0V)
•- SLICE jack outputs negative portion of mix (voltages less than 0V)
•Red and blue on all four mix/mingle jacks indicate positive and negative signal, respectively. Brighter LEDs
means more voltage, dimmer means less.
Advanced features:
•Inputs for channels 1+2 and 3+4 are normalized together:
•Plugging into Channel 1 (or 3) will split the signal to channels 1 and 2 (or to 3 and 4)
•A jumper on the back enables/disables this normalization
•Scale knob has three ranges that are selectable with jumpers:
•Bi-polar: -1x to +1x (inverting unity to unity) — default
•Uni-polar: 0 to +1x (level fader)
•Boost: 0 to +2x (twice the voltage gain)
•Input Header (2x4):
•Connects the output of a QCD or QPLFO to the SISM's inputs
•Plugging into the SISM input jacks overrides the signal on the header
•Output Header (2x4)
•Connects the SISM's channel outputs to the input of a VCA Matrix or other compatible module
(Mixiplexer or Intermix)
•PAD breakout header (2x4)
•Can connect to an external DIY module that enables a pre-set pad (attenuation) on each channel.
Usage:
•Attenuator (quad)
•Inverter (quad)
•Level shifter/DC offset (quad)
•Mixer (4 inputs)
•Splitter (dual 1->2, or single 1->4 using a stackcable or passive mult)
•Bipolar audio mixing: Useful for mixing various filter outputs with the original signal to create new filter
curves
•Voltage slicer: + and - portions are separated and outputted to the + and - SLICE jacks
•"Dirty" panning: apply a large slow wave to one channel, and the other channels will "pan" between the
SLICE jacks. The signals are half-wave rectified as they span both outputs
•LFO mingler: connect QPLFO outputs to SISM inputs
•Sequencer: connect QCD outputs to SISM inputs (or any clock divider/multiplier) and take the sequencer
output from the MIX jack.
•Add attenuation and inversion to any CV jack on other modules
•Keep all your fine-tuning controls for several modules in one place
•Manual voltage generator. With no input connected, each channel outputs a steady DC voltage controlled by
the SHIFT knob.
Specifications
•12 HP Eurorack format module
•0.86” (22 mm) maximum depth
•10-pin to 16-pin power cable (included)
•+12V rail: 51mA max
•-12V rail: 51mA max
•The 5V rail is not used
Controls
There are four identical channels on the SISM. Each channel has two controls: SCALE and SHIFT.
SCALE
Controls gain, attenuation, inversion.
The SCALE knob changes the gain of the input signal. If the
knob is all the way up (clockwise, or 100%) then the signal will
pass un-changed. This is called unity gain (1x).
Attenuate: to lessen, to make more quiet
If the knob is turned down a little bit, then the signal will be
attenuated. For example, if the input voltage was a wave that
ranged from +1V to +5V, the output might range from +0.5V to
+2.5V (50% attenuation). If you were controlling the pitch of a
VCO, then instead of a 4-octave sequence, you would have a 2-
octave sequence, your melody would be “squished”.
As the knob approaches center, the signal will become smaller and smaller, until it's zero (silent).
As the knob turns down past center, the signal will start to get louder, but will be inverted. For example, a +1V to
+5V wave might become -0.25V to -1.25V (inverted and then attenuated to 25%).
Invert: To make positive voltages into negative,
and vice-versa: the signal is “flipped” across 0V
When the knob is fully down (counter-clockwise), the signal will be the as the original, but same amplitude
inverted. Our +1V to +5V example wave would now be -1V to -5V. If this was a sequence being fed into a VCO, it
would be same as the original, but it would be shifted down 6 octaves and the intervals would be inverted (meaning
an upward step would turn into a downwards step, and vice-versa). Note: you could shift this back up 6 octaves
using the SHIFT knob (see next section), and the result would be an inverted melody in the same octave range.
Amplitude: The difference between the highest
and lowest points on a waveform
The Scale knob has three modes (see “Jumpers” section for how to set the mode). By default the Scale knob
ranges from negative unity to positive unity (-1x to +1x), as shown in the diagram above. This is called “Bi-polar”
mode because the gain ranges between two “poles” or extremes: negative and positive.
Bi-polar: Ranging between two extremes
Another mode is called “uni-polar”, which means the gain ranges between 0 and one “pole” (positive). This means
that the signal will be zero (silent) with the Scale knob turned all the way down, and will be unity (1x) when the knob
is turned all the way up. This is often useful with mixing audio if you don't need to invert the signal and/or you want
to quickly turn a channel down without finding the center point.
Uni-polar: Ranging from zero to one extreme
The third mode is also uni-polar, but ranges from 0 to 2x. This means the signal is boosted by a factor of 2 with the
knob all the way up. When the knob is centered, the gain is unity (1x). For example, a +1V to +5V wave would
become a +2V to +10V wave (at maximum).
SHIFT
Adds or subtracts DC offset, shifts signal. Provides steady voltage.
After the signal is scaled, it's shifted up or down along the voltage
axis. This is known as applying a “DC offset”. The shape and
amplitude of the signal are not changed, it's merely shifted up or
down.
DC offset: The amount of voltage a signal is
shifted above or below zero volts.
With the knob at center, no voltage is added, and the signal
passes unchanged.
Turning the knob up adds a positive voltage to the signal. If, for
instance, the input signal ranged from 0V to +3V, applying a DC offset of 1.5V would make it range from 1.5V to
Produktspecifikationer
| Varumärke: | 4ms |
| Kategori: | Tangentbord |
| Modell: | Shifting Inverting Signal Mingler |
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