Hi Bugsey

One trick you could try is to apply a very short delay (5 to 15ms) to your vocal track, that will give a doubling effect. You can also pan the source and the delay hard left and right respectively, that will also give your vocal a thicker sound and give it more presence in the mix. There are other things you can do to the original vocal to ‘thicken’ it e.g. add a slight pitch-shifting.

Give it a go and let us know how you get on

Nige