The Transposition section gives you detailed control over the playback speed of individual grains. Altering the playback speed of individual grains results in pitch-shifting, and in RTGS3 this is expressed in terms of semitones. Grains can be transposed to either an arbitrary degree of microtonality or according to a user-defined pitch class.
Each slider has a random range associated with it, which is displayed as a semitransparent red bar surrounding its control knob. For detailed information about how these sliders work see Tutorial 1: Understanding the RTGS3 slider controls.
Amount = the difference in pitch between the source sound and the grain generated, in semitones
"Mode" menu = sets whether to use a microtonal or pitched transposition scale. For information about the different transposition modes, see Tutorial 4: Transposition Tricks
"Range" menu = sets the maximum transposition amount that can be set with the slider. The minimum transposition range is 1 octave, the maximum is 8 octaves
When the "Mode" menu is set to Pitched, the "Set to" menu and the Transposition Map keyboard become available:
"Set to" menu = lets you quickly set the Transposition Map keyboard to one of several commonly used harmonic structures.
You can also set the Transposition Map keyboard manually by clicking the keys to activate or deactivate them. Keep in mind that the RTGS3 transposition system assumes that your source material is pitched to C. That means that if the G key is activated (is red), the source sound will be transposed either up a fifth or down a fourth, regardless of its actual pitch.