![]() The modulation source LFO2 or ADSR selected by the source selector can affect the filter frequency in a positive right half of the control area or negative the left half of the control area. Dual LFO work at low medium and high intervals with maximum frequencies in kHz far into the Audio FM series. These connectors synchronize both LFO to external gate signals so when a port signal of 5v or higher is applied to a socket when the positive ramp sets the corresponding LFO waveform to zero and LFO restarts with a rising ramp. If you set the filter resonance to the max it self-turns generates a sinusoid set filter cut-off to track the keyboard and you have an ideal carrier signal for FM. The said circuit is based on the Curtis chip but there seems to be no other Voodoo going on here.
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