Audio Frequency From Amazon Polly TTS Sound Wave

I am trying to get an audio visualization to match a sound wave from the Amazon Polly text to speech service. I can get this to work by referencing a saved wave file without issue. However the Polly TTS plugin that retrieves the text to speech uses a procedurally generated sound wave to play it as a 2D sound. When I reference this sound wave into a visualizer it does not work and does not see an audio spectrum it can use. Is there a way to convert the procedural audio stream sound wave to something that can be used for this? Here is a screenshot of my blueprint: