One of my clients approached me and asked if I could 'master' his recording. I told him that I put MaxI'm and get the overall level up to -.5dB, but I wouldn't do any more than that, and that he'd have to get someone else if he thought it nessissary.

He then asked if I used dither when I bounced the session to 16-bit, 44.1K Stereo (CD) file in Pro Tools, as someone told him it was nessissary (probably the same one who asked him about mastering).

As far as I understood it, Pro Tools doesn't need dither, as it takes the file and then converts it, not recording it as it plays.
...or am I wrong, and do I need to turn on Maxim's dither button before I bounce down the files in Pro Tools?