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Second order All pass "so_apf.h" might have missing frequency #5

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@visuttaja

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@visuttaja

I can see at top comment section mentioning frequency but parameters are only for Q and samplerate(fs).
Then when I test filter it gives only abrupt bump. Happily nothing worse happens though.
I think one of those fs's must be the frequency but I don't understand much about filters math so I cannot correct the situation my self. Maybe you could kindly review the second order all pass code to clarify which is the frequency - if any.
It is this part which I feel is missing frequency parameter and corresponding code part in file so_apf.h:

tp_coeffs& calculate_coeffs(float Q, int fs)

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