Feeding Diffraction into a Custom Plugin

Question

We're working on a custom low-pass filter plugin to improve the realism of the diffraction effects in our project. Our goal is to integrate this plugin with Wwise's diffraction calculations. To do this, we created a new Game Parameter in Game Syncs and used the "Bind to Built-In Parameter" feature to bind it to the object's diffraction value. We then used this Game Parameter to control the filter, and so far it seems to be working as intended. (Or is there a better way?)

Now we're trying to understand the exact meaning of the diffraction parameter in Wwise. Is it a measure of the extra distance (in percent) that the audio signal travels around obstacles, or is it related to the angles of diffraction? We're also unclear about the range of the parameter - does it go from 0 to 1, 0 to 100, or something else entirely? We cannot find any documentation on this.

Any insight or clarification would be greatly appreciated!