A simple two-node workflow for generating and saving brainwave-sync audio, which you may mask with my SonicColor Noise-node. Nothing extra needed. If you want a fuller windows-version in MS Store (still free without ads): https://apps.microsoft.com/detail/9MZVCP10QDVQ

More info in my Github repository: https://github.com/Dehypnotic/ComfyUI-Dehypnotic