Listener related parameters are available in the “Global Window”. From left to right, up to down, you can find the following controls.
“Reverb On”. Click on this checkbox to activate the Open AL internal reverberation unit.
“Quality”. Click on the pop-up menu to choose the desired DSP quality, from Min to Max.
“Gain”. Click and drag to set the desired global volume.
“Stereo Rendering”. Use it to force OpenAL to render to stereo, even if your default audio hardware is multichannel.
“High Quality”. Click on this checkbox to turn on HRTF rendering when OpenAL is rendering to stereo.
“Distance Model”. Use this pop-up menu to select the desired kind of attenuation caused by the distance. OpenAL does not define the units of measurement for distances. See’n’Sound LE uses meters. OpenAL provides means for simulating the natural attenuation of sound according to distance, and to exaggerate or reduce this effect. However, the resulting effects do not depend on the distance unit used by the application to express source and listener coordinates. OpenAL calculations are scale invariant. The specification assumes Euclidean calculation of distances, and mandates that if two sources are sorted with respect to the Euclidean metric, the distance calculation used by the implementation