I was wondering if there was a method on either Audition 1.5 or 2.0 that enables you to apply an effect on a range of frequencies. I know some effects let you apply it to a range but is it possible to do it for every effect?

Absolutely

1. Enter spectral view by "View -> Spectral Frequency Display" or Shift+F

2. Select the marquee tool (second toolbar button on mine) or press M

3. Draw a time-vs-frequency box around the section of audio you wish to work on

4. All edits and effects will be applied to the selection


Good luck!

Thanks! Much appreciated!