Ciao @SAbba.1 ,
The main idea of the FFT compare function is that if there is at least one line with data higher than the threshold, the function returns a 1, pointing that there is a difference.
The threshold is in the measurement unit of the data in input, so for an audio FFT is the dB, for accelerometer data is mg and so on.
The number line to compare in the FFT compare function refers to the number of line to compare before stopping, so if you put 5, the FFT compare will check the first 5 lines (it always jumps the first line, to discard the DC component, so in reality it will be from the second to the sixth), if you leave a 0 as parameter the fw goes on until the end of the file to compare.
While, the number of line to compare in the FFT line compare function is the index of the single line to compare, so the fw will only check that specific line.
In any case, the firmware is able to perform these compare functions only if the file is compatible, so you should record it with the FFT compare training app or a custom app similar to that.
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