some Reaper audio cleanup ideas

Use the Ripple Delete tool to enable Ripple Delete either for a single track or for all tracks -

https://www.youtube.com/watch?v=AW5G-60jH34
describes a useful click pop removal using trim tool - we can change the fade-in-out lengths for the trim tool at
Preferences -> Media Item defaults for new items from 10 ms to 50 ms.

And in using this for click-pop removal, we can pinpoint the correct location to use the trim tool by using the Spectrograph view - Spectral Edit -> View Spectrograph. In the track image below, the orange vertical line is the click - 

Some cleaning up tips
https://www.youtube.com/watch?v=Ar4hIbqTzAY
NR etc.

Screenshots from my current settings for audio cleanup and sweetening for voice-overs (VO) - 

1. Noise reduction with ReaFir to remove the background hiss,

2. Gating out background noises

3. Some compression

4. Followed by a little bit of reverb for the vocals.

This earlier post gives the method I have used to do RMS normalization for audio clips, using the limiter and manual control of the limiter threshold by watching the RMS levels on the Master track.