You need to make sure that your CAD Mic is properly setup in your OS. Just shooting from the hip here, lets use Win7 as an example:
( the setup manual for Win7 and your CAD Mic )
Once setup properly, you will need to go into the advanced settings for the CAD Mic in your Sound Setup on Win7 and set the Sample Rate on both your input and output settings. Once this is complete, proceed to Studio One and setup your Audio Device inside of Studio One; making sure that the sample rates match what you set in your Win7 Sound Setup.