This module is based on ideas presented in Electronotes #132. It is a VCF with a 'filter exciter' section to allow a wide variety of acoustic, semi-acoustic and not-acoustic-at-all sounds. In a sense it takes the concept of pinging the LPG or ringing a VCF one step (or 2) further. The decaying sound is fed back into the input via a VCA. The VCA can be controlled by a gate or an envelope (or both). Another interesting point is higher frequency sounds tend to be louder.....which is what happens naturally in the big room. Also, please note the pots go on the side of the PCB that has the pot symbol screenprinted, this is different to previous NLC PCBs……just look at the pictures, if you have time and it isn’t too much trouble.

VCO mode:
 Nothing in VCF input.
 Patch a gate into GATE and/or an envelope or other CV signal into ENV
 Patch CV into 1V/O or CV to control frequency.
 Use the BAND, LOW or OUT to get signals. BAND and LOW are basically sine. OUT has had some waveshaping so has a little bit more timbre to it.
 Use the ATT, DECAY and RESPONSE pots to shape the sounds.

VCF mode:
 Patch an audio signal into VCF
 The ENV and GATE inputs are now switched out of the circuit, so do not patch anything into them. The RESPONSE pot is also switched out
 Patch CV into CV and/or 1V/O to control cut-off and tweak the FREQ, FINE, CV and DECAY/Q pots as desired
 The ATT/VCF pot sets the level of the input signal. When turned up high, it is quite hot allowing a rougher, distorted signal from the outputs.