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Spectrum Pad - Audio Spectrum Analyzer App for the iPad
Function Generator
Enter in the start and end frequencies for the display, or use the default 0 to 20,000 Hz range.Fill and Logarithmic modes can be turned on and off with the switches.
The left and right arrows can be used to change the number of FFT bins, from 128 to 131072, in powers of two.
That's it!
Here are some details on directly connecting an audio line source to your iPad/iPhone/iPod Touch