I was never really sure how to use this filter until today — working on this program with about seven different interview set ups in different parts of the country, different noise environments. Thankfully, most of them are pretty quiet, but each one has just a little bit of buzz or hum or whine in the soundtrack. Apply the BNR filter, and that’s usually where I get lost. But this time, there’s enough of a pause in most of the dialogue tracks to highlight just a piece. Click on “learn.” Hit play and then stop. A little waveform appears. Super fit it and then drag the fit below the existing waveform. Then adjust the response and release down. Bring the noise reduction down, too — maybe -10 or more, but listen while you do it and you’ll hear slight alterations and a bit of flanging if you go too far. Increase the smoothing to iron out some of the flange and then tweak the frequency just a bit (probably bringing the gain up a little). Keep listening and eventually the settings will coalesce and you’re done. And the change is very dramatic, especially in headphones.