A: Spectroid uses multiple FFTs overlapped in frequency in order to provide better frequency resolution at lower frequencies than a single FFT. A $100 fee will be assessed electronically when the application is submitted (please have a credit card available). Spectroid app instructions You can use your smart phone with the right app such as AudioTool, Spectroid, or Audizr, or Spectrum RTA: there are over a dozen free Audio Analyser apps available to do it! It takes me a minute or so to measure the tap tones of a violin plate: it is particularly quick to use a smart-phone.
