These consist of a source selection knob and an FM (frequency modulation) amount knob. The new filter cutoff control knob is disabled when a jack is plugged into the socket. VCF CV input: This socket round the back of the machine adds an external 0 to 5v control voltage input that controls the filter cutoff. This mod adds a switch to select either a 24dB or less drastic 12dB filter response Both parameters are still also controlled by the normal programming methods which can set the range of the knobs control.ġ2dB / 24dB Filter Response Switch: Somewhat mysteriously the filter chip used in these machines has both 12dB/Oct and 24dB/Oct outputs but only the 24dB one is actually used. The filter cutoff knob allows you to perform long filter sweeps for those squidgy burbling analogue lines that you could never actually perform on a Poly800 before now. This can produce the kind of screaming tweeter eating top end and subsonic bass that gives these machines a whole new range of sonic possibilities. "The mods we have installed on this synth consist of 3 main sections, Filter mods, FM mods and Audio mods.Ĭutoff & Resonance Knobs: The new resonance knob can take the resonance well into self oscillation and far beyond what is normally programmable from the front panel.
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