You need to leave a few seconds of ambient sound only before actual content recording. Some Sample C ompressor Effect Settings To Get You Started Make-up gain won't increase the level of that noise with the voice. Noise, and if done before compression, the compressor's This reduces low‑end rumble and high‑frequency Try using EQ to rreduce frequencies below 80Hz and above 12kHz to make your recording sound better. Normalization is normally best done last before export of the production audio.ONE TIME.Normalizer Plugin: Immediately after recording capture (or import) of your audio this effect should be used to remove any DC offset that may be present.Step 2: You need to Split the track Once you have your audio track in Audacity, it’s time to split it. Try them, maybe take notes, and find the approximate settings that work for you or the talent you are orking with. Step 1: Load your audio file into Audacity Open Audacity up then select File > Open and choose the file you want to make edits on. Here are some Audacity plugin sample settings that will help you get the best professional sound even when recording at home or with a cheaper microphone than you would like. Assuming you can automate parameters in Audacity.The goal is to improve intelligibility and qualities of the voice, without the change being audible by an unnatural sound. If Audacity doesn't allow you to do the second bit, or if it's a bit tricky, you could manually record and edit automation of the wet/dry mix.

You would probably need an envelope follower or a gate or something with side-chain capabilities, and you would need to do some routing. You could isolate the most active frequencies from the conversation, and use it as a 'side-chain' to control the wet/dry mix of the mid/side EQ. If you are capable, you could refine this more. This will leave you with a stereo file with most mono information in tact. I would use a Mid/Side EQ to attenuate the specific frequencies from the mid channel.

I would instead use a more subtle approach. drums, low frequencies, orchestra, main vocals, etc. As I don't know what the recording is like, this could be a lot of information. I don't think you want to use Simon Bosley's solution for this situation because if you do, you will be left with a mono track with any similar information attenuated or completely missing.

Edit vocals in audacity