Is there a way to drop audio on a recording

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SeminoleMarine

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Don't you know some peeps at NCIS that can do that for you?

You'd probably get better answers on the Tech Board

If you are talking about a smartphone recording, you may not get very good results with an "app". Audacity is considered one of the best apps for sound processing tools but far from "pro". If the background noise is traffic, other voices, or a large crowd it may not be possible with an app. The human voice has a wide frequency range but centers around 1000hz. Most of these programs work in the same but reverse fashion as the lame apps that supposedly filter out a vocal track for backing track/karaoke use. They are pretty cheesy... brutal for the integrity of the overall track but boosting the range the human voice in and filtering is what software "attempts" to do. Not terribly effective, though...can be quite terrible. If this recording is something really important to you, you'd have much better success sending it off to a facility that does forensic audio enhancement, audio cleaning, etc. Most services charge anywhere from $75 to $150 to process and filter 60 minutes of audio. Do a search. try to speak with them, and explain what you need. They may ask you to send a flash drive or possibly email a copy, they will send you a "cleaned' or "enhanced" finished product that will be light years better than any app or software that doesn't cost you thousands. The turnaround "should" be just a couple of days and you'll have your cleaned audio.

Autocorrelators are good single-ended noise reduction devices, but the ones I have seen are hardware based, not software apps.