Best audio analysis app I've found – Spectrogram Pro (with super-smooth 60Hz update) Review

The spectroscope, plus the sonogram on same screen with real time... perfect. Ability to drag a guide with note frequency? Even better... I'm using it with a cheap USB audio interface to viz my HW synths... If this could sit in audio bus, that would be really cool..
Review by MusixMonkey on Spectrogram Pro (with super-smooth 60Hz update).