Jules72 Ozone is a mastering tool. Bit like an intelligent EQ, so you can tweak the mix to add more impact, accentuate vocals etc. A compressor lowers the level of the loudest parts in your mix – the peaks you see sticking out when you view the waveform. By making them softer (gain reduction), it reduces the overall dynamic range – that is, the difference between the loudest and quietest sections of a mix/track- that’s especially useful when you overlay 2 tracks during a mix as it reduces the increase in volume that sometimes results, giving you smoother transitions.
There are a lot of board members who are much more experienced with these than I am, so maybe they can explain further benefits. I’ve just started using Ozone as have always been impressed with the production on @Kumquat ’s mixes and know he often uses it.
