[cshaw]

This seems to be a problem when you use your interface to play back your Mac audio. PT and your Mac are trying to access the same interface and usually the Mac wins. Try switching your Mac to Internal Speakers in the system prefs and start up PT9 afterwards.

I find that if I use my interface to play back the computer audio that PT seems quieter. Then I realized that the computer was controlling the volume of the interface. Raising the computer volume fixes this, but it's a better practice to set the computer audio to internal speakers before starting PT.