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