The Plusdistortion plug-in is an emulation of an MXR Distortion+. It has a wide range of distortion sounds from a little bit of dirt to a giant fuzz/crunch tone. It emulates the germanium diode clipping used in the Distortion+, as well as the lo-fi op amp and just about every other aspect of the circuit. Many parts of the effect are also tweakable, so you can craft your own D+ based distortion.
In addition to the normal distortion and output controls, the following controls have been added:
Input level - This is a volume control on the input of the effect. You can adjust this to compensate for different pickups, different input levels, etc.
Oversampling - This turns 2x oversampling on and off.
Input Type - 'Pickup' adds a resonant low-pass filter on the input to emulate the interaction between the 1nF cap on the input and a guitar pickup. 'Buffered' removes this filter.
Op Amp Clipping - This controls the amount of distortion contributed by the emulated op amp.
Diode Clipping - This controls the hardness of the distortion from the emulated diodes.
High Cut - This reduces high frequencies on the output. Many distortions use controls like this to reduce harshness.
Low Cut - This reduces low frequencies on the input. Many distortions use controls like this to reduce muddiness and increase clarity.