I have Acid pro 9, and I struggle to re-open the beat mapper on an already beatmapped track. That is when I open a vocal track file on to the sequencer it auto offers to beat map the file, but once I beat mapped it, I cannot re-open the beat mapper again on the same track. I know you can but I'll be damned if I can find it after a years use I still just delete the track if its not mapped acurately enough and start again. But I'm super frustrated at this. Plaese help. Tell me where the damn option to re-open the beat mapper is.

I am guessing you are looking for the "Beatmapper" button. So, Right click on the track and choose "clip properties", then you should have two tabs, General and Stretch, click on Stretch and the "Beatmapper" button will be at the very bottom. Of course, in General tab, you have to have the sample "Beatmapped" and not a one shot or loop.