[GraemeJ]

Even IF Trotsky26 wants this or that be sure Audacity can do your compression/RMS too:
https://manual.audacityteam.org/man/compressor.html

If the desired end result is a series of tracks which all play at the same volume (thus avoiding having to change the volume control for every new track) then the RMS average of each track needs to be the same - compression is not the way to achieve this and as far as I am aware, it's not a function available in Audacity.  

Of course, since many modern recordings are compressed to within an inch of their life anyway ("louder is better") it's not something that needs to be done as often as it used to be.