I've done this initial app just to gauge if there is any interest in this at all (friends were telling me "no", but they don't know anything about music :)). I am thinking that I could do some visualisations for free, and add the fancy ones as a paid option. There are many visualisation apps out there, but none have the same frequency detection algorithm... Many people asking to open source it now, but I don't know how can I do it, and also get paid for making something people can pay for on top of it... Just trying to make something that would allow me to leave my (already high paying!) job... I'll need to think :)