Expert Sleepers Silent Way v2.4.3 - Manual (Page 93)

CV Trigger
If the plug-in is configured to receive an input signal, you can
optionally have it triggered by the incoming signal as well as
or instead of by MIDI.
Pressing the ‘Enable’ button enables this feature.
The ‘Threshold’ knob sets the level the incoming signal has to
exceed to trigger the plug-in. Note that this is strictly a DC
level, not an amplitude. If you want to trigger the plug-in with
an audio signal, precede it with an instance of Silent Way
Follower .
Voltages
The two knobs set the minimum and maximum voltages gener-
ated by the plug-in. Both range from -1.0 to +1.0, and it’s fine
for the Min to actually be higher than the Max, if for example
you want an inverted envelope.
Overrides
Exactly the same as the Overrides in the Voice Controller, except
that this plug-in has no Pitch output.
Trigger
The ‘Length’ control sets the length of the trigger pulse that is emitted in
Trigger mode, in milliseconds.