Stereo panning, i.e., this disables HRTF-based rendering.
BinauralLowQuality
HRTF-based rendering using First Order Ambisonics, over a virtual array of 8 loudspeakers arranged in a cube configuration around the listener's head.
BinauralMediumQuality
HRTF-based rendering using Second Order Ambisonics, over a virtual array of 12 loudspeakers arranged in a dodecahedral configuration (using faces of the dodecahedron).
BinauralHighQuality
HRTF-based rendering using Third Order Ambisonics, over a virtual array of 26 loudspeakers arranged in a Lebedev grid: https://goo.gl/DX1wh3.