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Am I the only one that finds it odd that the decay rate of your BFD is over 100ms?
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I don't believe that it's the decay rate of the BFD at all.
A loopback cable (with the BFD removed from the circuit) will show exactly the same result.
Isn't the 100ms that you refer to a function of the duration of the impulse response analyzed?
For example, if connect a loopback from line-out to line-in of the soundcard and sweep a measurement to 200Hz, and increase the duration of the gate out to 1000ms (1Hz frequency resolution), I would get the following result.
waterfall 1000ms duration.jpg
But if I decrease the gate to 100msec (10Hz frequency resolution), I would get the following result.
waterfall 100ms duration.jpg
brucek