The Amplitude & Tone Controller consists of two units in series: first of all we find a discrete low pass filter with vactrol control and diode limited resonance. It is followed by a discrete VCA with manual amplitude control as well as exponenial and linear CV inputs. As the exponential CV input is normalized to the cutoff CV input of the filter you can control harmonic content and signal level with only one CV, similar to a lopass gate. All CV inputs are exipped with bipolar attenuators.
At high input gain settings the module starts to distort very nicely wich plenty of character especially with resonance turned up. Careful balancing of those two parameters allows you for blending between self oscillation and VCA distortion.
Audio input and output
VCA: linear CV in, exponential CV in (normalled to VCF CV in)
filter: Cutoff CV input
3U Eurorack module, 16HP wide, 26mm dep
Current draw; 30mA @ +12V and 20mA @ -12V