I recently got a project that was recorded in a DAW (BPM unknown). In GB, I can align/sync the GB click and BPM to around the first 16 measures, but the song seems to drift from the GB click. Is there a way to quantize a prerecorded track?

I have no problems working with a blue/green background to key over, but I am working with virtual sets that have several sections that are blue screen monitors. My problem is replacing those blue screens with video or pictures. When I try to resize a picture it only crops it and it loses perspective. I can't seem to replace those blue screens. I have both imovie 6HD and 10.1.14. Any help would be appreciated. I would attach a pic of the virtual set, but can't attach

Thanks. I too am mainly audio. Actually I'm trying to overlay a pic or video on to the virtual set which has blue screen monitors as part of the virt set