Make Noise XPO, Manual

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The Waveform Outputs (cont.)
Vari-Timbre is derived from the Sine, Triangle, and Sawtooth waveforms. The Center
parameter cross-fades both left and right Vari-Timbre signals from Sine to Sawtooth, a
function found in classic WEST COAST synthesizer circuits such as the Buchla 158 and 258.
This is useful in a way that is similar to a Low Pass filter, where the sound can transform from smooth and soft, to more biting
and bright. The resulting Sine/ Saw shape is then further processed with the Modulate L/R parameters cutting the Triangle
wave into the waveform determined by Center parameter (Sine/ Saw). From 0% at full CCW, to 50% at about 12:00, to 99% at
full CW. Using control voltage, the triangle’s presence can be increased all the way to 100%.
The Left and Right Variable outputs are controlled independently by the Modulate controls. The Center parameter operates
identically on both outputs.
When the Right output is unpatched, the Left output contains a sum of the Left output and an inverted copy of the Right
output. Using just the Left output in this case for a Mono signal allows for interesting phasing behaviors when modulating
one or both waves. The Center parameter tends to be more subtle in Mono since there is much opportunity for phase
cancellation through the center of the resulting waveform, but may still provide increased harmonics when modulated at
audio rate. It is this MONO functionality that allows Make Noise to create the elusive Bat waveform.
The Wavefolding outputs utilize wavefolding circuits similar to the Final output on the
DPO and the Multiply circuit on 0-Coast.
With Modulate full CCW, the wavefolder gain is low enough that the output will be functionally silent. As Modulate L/R
increases, a wave will appear and then fold over on itself. The number of folds increase from zero to five through the range of
the Modulate L/R parameters. The Center parameter modulates the shape and fold point of the wave sent through the
wavefolder, with the simplest saturated sinusoid wave appearing at full CCW and a thin crispy series of Spikes occurring Full
CW.
The Left and Right Folded outputs are controlled independently by the Modulate controls. The Center parameter operates
identically on both outputs.
When the Right Folded output is unpatched, the Left output contains a combination of the Left and Right wavefolding
circuits. Using just the Left output in this case for a Mono signal allows for interesting phasing behaviors when modulating
one or both waves.