Acoustica Mixcraft 7 - Manual (Page 250)

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MID-SIDE ENVELOPE FOLLOWER+
An envelope follower using the dynamics and amplitude of the incoming audio to
modulate the cutoff frequency of a filter… the result is a funky, liquid filtering effect
that dynamically responds to music content. The signal is split into mono (Mid) and
stereo (Side) signals. Each part can be boosted or attenuated to create panoramic 3D
effects.
MID-SIDE HARMONIC VITALISER