Envelope follower and VCA
Normally two Envelope plug-ins will be used with the first set to FLAT/ENV to separate the signal waveform and envelope and the second set to L x |R| to recombine them. Effects applied to eith the left or right channel between these plug-ins can be used to process the wavform and envelope separately, for example delaying the envelope relative to the waveform, or applying waveshaping with a constant "drive" level.
Note that in L x |R| mode with a mono input the plug-in acts as a 2:1 expander.
This plug is intended for advanced users and is best suited to modular environents such as AudioMulch. It can output high levels of DC which may damage speakers and other equipment.