Best thing to do is to try to replicate the settings on the channel EQ on your mixer with the Digi 4 Band EQ or other EQ plug ins such as Waves Ren EQ/ Q10 EQ. This also gives an insight into how EQ works with different sounds/mixes. Also read as much as you can about EQ.
EQ Tips
EQ Tips2
Quality (& expensive?)outboard EQ & Reverb still sound better to most ears than plug ins, however the Digi stock plug ins can get great results as well.
In fact the EQ on your mixer might still be worth using, you can clean up the hiss after you have sent the track back to the mixer for EQ treatment.
Good Luck [img]images/icons/smile.gif[/img]
John k
London N19