Audio input is used by generative modules like FFGL to create audio reactive visuals.
Any audio device installed and enabled on the PC can be used by Morph Pro. Switch to an audio device by clicking from Audio > Settings, selecting the desired device, then clicking Connect.
Morph Pro passes in both raw (normal audio) data as well as FFT (audio spectrum) data to generative modules. The audio engine operates entirely on the GPU. This minimizes the load of processing FFT data that is normally handled by the CPU.