How do you get an instance of an FX plugin from Unity?

Question

Hello, I wrote WWIse FX plugin that gets some PCM data and stores it in a static array in my IAkInPlaceEffectPlugin class. This plugin lives on a bus and whenever audio goes through that bus the plugin writes the PCM out to this static array. Then, inside of Unity I use the C++ extern stuff to get that PCM data for some processing. This works fine, however, if I have multiple instances of the plugin, they're both going to be writing to this static array. How do I get a particular instance of an FX plugin from the Unity side?