Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
To start with, I need to know the version of mac osx you have on your machine, you can check as follows.Click the apple sign at the top left of your screen, then click about this mac. And then where it says version, send that to me as a reply.
Also, when was the last time your Mic worked with this setup? Has it ever worked? Have you upgraded the os in the meantime and thats when it stopped working?
Any other relevant details you can think of will be appreciated,
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.
Ahh. So its a brand new mic.
What input is the mic plugged into?
In audition, what choices do you see for audio input ?