Hi, I wanted to second the suggestion of adding sounds. I just purchased the app yesterday for iPhone. Thanks for making this! Audio feedback is a great idea, allowing one to close one's eyes and enabling use by the blind community. However, I would suggest not using pure sinewaves or even harmonically enriched tones. This could be somewhat monotonous. Interaxon's approach of sounds like birds chirping, rain etc. would be more pleasing. I suggest something like a forest chorus. Each item could be a different animal and/or sound (crickets, frogs, stream, etc.) that would sound when a threshold is passed. If the user can select which sounds to turn on, they could focus on parameter of interest. Also, the result would be a relaxing forest chorus that you could control with your mind!