Audio-Specific Float Slider Variables

PF_Param_FLOAT_SLIDERs contain several parameters not found in other sliders; flags, phase, and curve tolerance.


The only flag available is PF_FSliderFlag_WANT_PHASE.

This registers the effect to receive updated phase information from After Effects during audio rendering.

To understand what this flag does, turn it off and check your output.


This is where the requested phase value is stored.

Curve Tolerance

Curve tolerance is used by After Effects to subdivide the audio effects’ time-variant parameters. Set this to zero for default behavior (or for non-audio FLOAT_SLIDER parameters).

What’s Zero, Really?

When amplitude is zero, After Effects is at -192db.