Vintage B3 Distortion effect in Logic Pro for iPad
The Distortion effect simulates an overdriven two-stage tube amplifier. Its primary role is to simulate the Leslie amplifier or another amplifier used to feed the Leslie speaker cabinet.

Vintage B3 Distortion parameters
Distortion On/Off button: Turn on or bypass the Distortion effect.
Dist Drive knob and field: Set the amount of overdrive distortion. The output level is automatically compensated for, so there’s no need for a distortion output volume control. A level of 0 effectively turns off the Distortion circuit.
Dist Tone knob and field: Change the distorted portion of the sound. This has no effect on the dry signal portion. Limiting changes to the distorted signal allows for very warm overdriven sounds that do not become scratchy if you try to get more treble out of Vintage B3.
Dist Type pop-up menu: Choose a tube amplifier model.
Growl: Simulates a two-stage tube amplifier. It closely resembles the Leslie 122 model, the classic partner for the Hammond B3 organ.
Bity: Reminiscent of a bluesy guitar amp.
Nasty: Delivers hard distortions and is suitable for very aggressive sounds.
Class AB Soft: Tube distortion sound modeled on a class AB amp head with a subtle distortion.
Class AB Hard: Tube distortion sound modeled on a class AB amp head with a more pronounced distortion.
Download this guide: PDF