Removing echo in audio

Hi Everyone, I'm using fcp 7 , I did a interview in a church and there is an echo sound in the audio, what audio filter can I use to lessen it? Thx!

In my 15 years as a sound editor (before computers) I learned a very odd trick, but it requires an acoustically pristine room. Set up a speaker and a microphone about a foot apart, each the best and flattest you can get your hands on. now get a bath towel and get it nice and damp-- not soggy, and hang it between the mike and speaker. play the audio out of the speaker and rerecord. Mess around with placement. you can knock down the echo considerably, but depending on how "bouncy" the original room was, you will never eradicate it. And if the towel is too wet, you'll muddy up the primary.
you might think I'm kidding, but I'm not. Do however keep in mind that this is a last ditch effort when all else has failed. Easier to reshoot. Take along an audio engineer; they can be worth their weight in gold.

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    Hi
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    Many Thanks
    Adrian

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