I am not sure that the question was answered in a proper way. Sure there are lots of tools to use but how can I look at my levels and add key frames in the Source Monitor? Since the audio default is stereo (god knows why unless you use the on camera mic from your home video camera) making global audio changes as Mr Barrie suggest is a bad habit to get into.
FCP used to let you do this simple task. Do you have to export to Audition?