Audio Damage Mangleverb - Manual (Page 10)

Envelope Follower
In addition to the LFO, Mangleverb has an envelope follower as a second source of
modulation signals. The envelope follower responds to the overall loudness of its
input signal and (like the LFO) can be used to control the filter and/or the VCA.
The two knobs labeled SHAPE determine how rapidly the envelope follower
responds. The ATTACK knob adjusts how quickly the envelope follower responds
to increases in the incoming signal’s level. If the ATTACK knob is turned fully anti-
clockwise, the envelope follower’s output jumps almost instantly in response to
increases in the input signal’s level. As you turn up the ATTACK knob, the
envelope follower reacts more slowly to signal-level increases. The Attack knob is
useful for making the envelope follower’s output smoother when the input signal
contains sharp transients, such as drum sounds.
The DECAY knob adjusts how quickly the envelope follower’s output decreases as
the incoming signal’s level decreases. If the DECAY knob is turned fully anti-
clockwise, the envelope follower’s output drops almost immediately when the
input signal’s level decreases. As you turn up the DECAY knob, the envelope
follower reacts more slowly to signal-level decreases. The DECAY knob is useful
for stretching the envelope follower’s output, making it fade away more slowly than the input signal.
The envelope follower’s input can be connected to one of four different sources depending on the setting of its
TRIGGER switch. This switch also affects the SENSE knob, so the envelope follower has four somewhat distinct
modes of operation depending on the setting of the switch:
 INPUT – This is the operational mode you probably expect: the envelope follower receives its input
from the plug-in’s signal input. You can use this mode to create auto-wah filter effects or mess with
the signal’s dynamics. The SENSE knob acts as a gain control for the signal; turning it up boosts the
level of the signal before it enters the envelope follower.
 MIDI – In this mode, the envelope follower receives a gate-like signal when Mangleverb receives MIDI
notes. This signal turns on when a note-on event arrives, and turns off when the last note-off event
arrives. The level of the signal is proportionate to the velocity of the note. What this means is that you
can use MIDI notes to open and close Mangleverb’s filter and/or VCA, creating gated-reverb effects,
sequenced filter changes, and so on.