Silent way follower, Introduction, Follower – Expert Sleepers Silent Way v2.4.3 User Manual
Page 54: Source, Input filters

Silent Way Follower
Introduction
Silent Way Follower tracks the pitch and envelope of incoming audio, and outputs pitch
and envelope CVs accordingly.
Follower
The “Follower” section defines some basic parameters of the pitch and envelope detection
processes.
Source
The “Source” drop-down sets whether the plug-in operates on its left in-
put, its right input, or a sum of the two (“L+R”).
Input Filters
The “Highpass” and “Lowpass” knobs control two simple fil-
ters that are applied to the audio before the detection takes
place. Typically you would adjust these to filter out any signal
outside of the base pitch you’re trying to detect, to avoid the
pitch detector locking onto any overtones or noise elements.
E.g if you know you’re trying to track a bass part in the octave