The related value represents the interpolation filter length used by the libopenmpt mixer. The default value is 0, which indicates a recommended default value. The supported value range is [0,inf). Values greater than the implementation limit are clamped to the maximum supported value.

Currently supported values:

0: internal default
• 1: no interpolation (zero order hold)
• 2: linear interpolation
• 4: cubic interpolation
• 8: windowed sinc with 8 taps

The related value represents a relative gain in milliBel. The default value is 0. The supported value range is unlimited.

The related value represents the stereo separation generated by the libopenmpt mixer in percent. The default value is 100. The supported value range is [0,200].

The related value represents the amount of volume ramping done by the libopenmpt mixer. The default value is -1, which indicates a recommended default value. The meaningful value range is [-1..10]. A value of 0 completely disables volume ramping. This might cause clicks in sound output. Higher values imply slower/softer volume ramps.