What useful information is NOT in the manual?

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Any useful, remarkable or technical information that not in the manual.

Here's my two cents:
The SSL Compressor actually adds gain (or enhances the transient) when you do not have the Fast or Peak engaged.

The Damage Control on Scream4 is essentially just Input Gain. However, on the the Distortion mode, the Damage Control sweeps between mostly even to mostly odd harmonics.

Alligator adds distortion even at Drive set to 0

The Stereo Imager, when set to Mono - simply removes the Side signal. However, when set completely to Wide, only decreases the volume of the Mid singal slightly, and increases the Side singal. Never totally removing the Mid signal.