PT Changing tempo w/out changing midi performance??

[d.dot]

Is there a way in pro tools to change the tempo without altering the timing of the midi performance?

I recorded some tracks along to some pre-recoded audio without setting the tempo. I now need to go back and clean up some stuff using the grid and a little quantize, but now when i used the indetify beat function to get the correct tempo, my midi plays slow and out of time with the original audio. Is there a way?

PT 6.9

Thanks in advance.

ps. The digi site is down at the moment, or else i would have posted there.

Thanks again