AudioTools is a suite of professional-grade audio and acoustic analysis apps. Included in the price of this app is a great collection of professional tools SPL, RTA, FFT, Speaker Polarity Test, Generator, Audio Scope, CLF Viewer, and Recorder, and the framework to add more powerful modules as you need them. * THD+n (requires iAudioInterface)* Impedance Meter and Plot (requires iAudioInterface)*Phase Meter* Amplitude Sweep