To OP,

VST and DX plugins can be used either way; during the recording or after.

I prefer after myself, as I'm OK with setting the levels and monitoring them as I record. You do not need a hot signal, give yourself some room.

In PGMusic products it is called Input Monitoring, and is an option, but it's a bit more complicated to do as you record.
I would definitely try it after to start with.

In Realband there a button on the track in some views called FX, just put what you want in there.
In BiaB I think it works kind of the same way but you'll find it in the mixer area.

Also, in addition to PGDynamcs compressor there are many free ones available and many you can buy.

ReaComp (from Reaper/Cockos) is an easy one to learn on, as is Classic Compressor, which I happen to like for vocals. Both are free.

Make your sound your own!
.. I do not work here, but the benefits are still awesome