LinPlug Organ 3 - Manual (Page 19)

The Master Section
The Master Section is located under the Vibrato Section. It contains
controls for Click, Motor, Age, Drive, Bright and Body as well as Volume
and Velocity dials.
“Click”: sets the amount of keyclick applied to each note being played.
The "click" is a very short sound that was produced on classic drawbar
organs when a key was pressed.
Motor: adjusts the amount of motor noise that is added to the output. On
classic tonewheel organs this sound was always present to some
degree.
„Age“: simulates the “age” of the organ. This is done by adding random
changes to the sound of the instrument that were typical for old and
hardly-used mechanical organs.
„Drive“: determines the degree to which Organ 3's output is distorted.
„Bright“: changes the sound of “Drive”. Turned to the left the sound will
be darker, turned to the right will cause Organ 3 to “scream”. “Bright”
works like a Lowpass-Filter.
LinPlug Organ 3 User Guide Page 19