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Update rack_xt_manual.mdx
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Add unison and cxor image; add cxor description
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baconpaul authored Dec 5, 2023
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Expand Up @@ -274,7 +274,7 @@ In Window/WaveTable in one shot mode it starts the one shot again. This mode is
a wavetable which acts as a one shot. In this case, on trigger the playback will start from the morph value which
is in effect when the trigger arrives.

# The VCF and Waveshaper Modules
# The VCF, Waveshaper and Digital Combinator Modules

## VCF

Expand Down Expand Up @@ -321,6 +321,22 @@ so the filters dials are somewhat less suitable targets, comparable to the VCF.

![Waveshaper Module](/images/rack-xt-manual/waveshaper.PNG)

## Digital Combinator / CXOR

The Digital Combinator module provides two independent polyphonic circuits which can use a variety of digital
signal combination techniques to add texture and growl to a pair of signals. The basic setting 'Ring Modulator',
upsamples the signal, multiplies a * b digitally, downsamples, and sends it to the output. As a result this
module has a latency of 4 samples, the minimum block size for the Surge halfband up/down filters.

The module also features a large number of other combination functions, though, each with a unique and signal
dependent character. The best approach is to just try them and see what sounds good!

Finally, the module allows a double-cascade. If the second input "A" input has the power button between
the inputs activated, the second circuit will use the output of the first as its input without the cost
of an additional up/down sample, allowing for a wide variety of three-signal combinations.

![Digital Combinator](/images/rack-xt-manual/cxor.png)

# The Surge Effect Modules

## The Effect List
Expand Down Expand Up @@ -594,7 +610,10 @@ As voice count increases you may need extra VCOs. The module supports up to 4 su
unison voices, so can add 4-voice unison to 16-way polyphony or up to 9-voice unison with 7 voice polyphony if all the
VCOs are connected.

To see a demonstration of the unison module just before we shipped 2.2, we prepared this [development preview](https://youtu.be/w0fXLlHKLrk)
To see a demonstration of the unison module just before we shipped 2.2, we prepared this [development preview](https://youtu.be/w0fXLlHKLrk).
A complete wiring, used to make two BogAudio PWM VCOs participate in polyphonic unison with a PWM sweep, is shown here.

![Unison Module Example](/images/rack-xt-manual/unisonex.png)

## The Mod Matrix

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