A few years ago, I wanted to build an oscilloscope in my pocket, so I went ahead and did it. Then I wanted a spectrum analyzer, and then an equalizer. 1) oScope — an oscilloscope in your pocket. https://itunes.apple.com/us/app/oscope/id344345859?mt=8 2) Octave — a real-time audio analyzer. https://itunes.apple.com/us/app/octave-an-rta-for-the-iphone... 3) Fourier — a spectrum analyzer. https://itunes.apple.com/us/app…
Basically, it sucks to be stuck on the "passive" receiving end of a passive income project. Though actually, it's Apple's fault for not letting me trial software.
But I'm glad to hear these projects are working out and wish you continued luck!