Analog Physical Modeling Synthesis and the PLG150-AN Tone Generator
Once the VCO 1, VCO 2, Ring Modulator, Noise and Feedback signals are mixed in the MIXER
module, they can then be ﬁltered by the VCF module. The VCF includes a comprehensive set of ﬁl-
ters, including Low Pass Filter (LPF), High Pass Filter (HPF), Band Pass Filter (BPF) and Band Elim-
inate Filter (BEF). You can determine the Cutoff frequency of the VCF, as well as amount of
Resonance, or emphasis around the frequency cutoff point. Resonance and Cutoff actually work
interdependently with each other, and their overall effect depends also on the voice selected. On the
PLG150-AN, you can adjust the Cutoff frequency over an exceptionally wide range. Also, high val-
ues for Resonance create a relatively warm analog-like quality.
The Filter Envelope Generator (FEG) lets you determine how the timbre of the signal changes over
time, and the LFO1 or LFO2 can be used to modulate the VCF to create wah.
The FEG features four parameters:
The VCA module is where the overall output level of the signal is determined. The Amplitude Enve-
lope Generator (AEG) lets you determine how the volume of the signal changes over time, and the
LFO1 or LFO2 can be used to modulate the VCA to create tremolo.
The AEG features four parameters: