AS SPAWN - VCF Modulation and Envelope Control; VCF CV Input 1 for Frequency

The Mod knob introduces either triangle, square (from the VCFLO) or no modulation to the VCF’s cut-off point.
The Envelope knob alters the cut-off point according to the set up of the envelope generator allowing automated
shaping of the filter negatively and positively.
This is the main control voltage input for the VCF and has control characteristics of IV/OCT. An internal patch is
provided from the Midi controller. Allowing the filter to ‘track’ the keyboard, as with other pre-patched Midi routing
this can be isolated using the ‘Midi Routing’ switch in the Midi section. Whether the Midi pre-patch is active or not
the CV1 socket can be used to control the VCF frequency.
The CV2 socket and associated amount pot is another method of controlling the frequency of the filter.
The Amount pot also acts as an invertor so that positive and negative frequency sweeps can be achieved from
a positive control voltage
Example: If a keyboard generated control voltage was applied to the CV2 socket and the amount pot was turned
approx 95% in the clockwise direction as the keyboard is played the filter would track the keyboard with the
IV/OCT characteristics. As the notes are played higher up the keyboard so the filter frequency would increase, if
the amount knob is turned approx 95% counter clockwise again the filter would track but at -IV/OCT, effectively
the higher you play up the keyboard so the filter would decrease.
This is the audio output of the filter prior to modification by the VCA.
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