Adjust note chance, length and velocity relative to their pitch:for example give low notes higher velocities and longer lengths while making higher notes less probable.

Relative mode uses current parameter values as a base , while fixed calculates them purely based on their actual pitch.

Auto calculates note pitches based on the current range of notes, full assumes the entire keyboard should be accommodated for in calculations, while manual allows you to specify a range with the note sliders at the bottom.