Audio spectrum analyser for your microphone. 64 up to 8192 frequency divisions (128 to 16384 FFT size). 22 kHz spectrum range (can reduce down to 1 kHz for higher resolution). FFT Windowing (Bartlett, Blackman, Flat Top, Hanning, Hamming, Tukey, Welch, or none) Auto-scale or pinch to zoom, drag to pan. Linear or logarithmic scales. Peak frequency detection (polynomial fit). Averaging, Min and Max. Save CSV data files (uses Write External Storage Permission). Free or snap to peak cursor. Octave