I take it that you are requiring either lip sync or certain elements of content to happen at a certain exact points. The only way to do this is IF the band is playing to click, is to get the protools rig to send you LTC(audio timecode).

In FCP i would make sure that your re-conformed mov is accurate to the audio track as when you reconform without audio there is a potential over a 3 min clip for considerable frame drift, cut and add frames as needed. I would recomend that in the sequences settings you set the timeline to the timecode you are working to. There are lots of little points in the work flow that if you don't do it just so, you will come unstuck. If you can install FCP on you catalyst system you can run FCP ref movs, that you have edited on that machine, and test and test till it is right and you can play back accuratly.

Freerunning clips if you need to be frame acurate will always end in tears.

email me if you want a more detailed explaination.

Phil
Philip G Haynes
Live Visual Design and Direction