I've never done much with audio and I've been searching this forum and the internet for ideas about how to filter brain wave information into theta, alpha and beta frequencies. It seems that people usually use fft, I haven't seen anyone use fffb~. But I tried it and I can't perceive any problem with this method. It seems to work, but it's too simple. Maybe I am misunderstanding something big. In this patch, the eeg values (microvolts, offset by 4000) are coming from OSC at a rate of 128 per second. I would appreciate it if someone could look at it and caution me about potential problems. Thanks so much.