While recording,
1. Record with minimum ambient noise - switch off a/c etc. Don't use mics like wireless mics which give a hiss.
2. Have both shotgun mics and lapel mics for both guest and host in case of video interviews, or have dynamic mics close to speakers' mouths in case of audio-only interviews.
The rest of the stuff has to be done in the post-processing.
1. For each track recorded, do noise reduction using Adobe audition or cool edit pro or whatever, my settings in CEP 2.0 are as shown below, after doing a "Get Profile from Selection" using a section with only noise.
2. After the NR, doing a suitable noise gate, like the one below, is recommended.
3. Only after these steps, if the different tracks (interviewer and interviewee) are merged, and then normalized, we can have best results.
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