As far as Core parking, go start run and enter the following: (copy and paste rather than typing)
control.exe powercfg.cpl,,3
Then under Processor power management (Should be second from the bottom), set both Minimum and Maximum processor rate to 100%. Make sure System Cooling Policy is set to Active (This should be set to that already)
Regarding the AUD.ini file
Your AUD.ini file should be in your X3 folder which is in this folder %appdata%\Cakewalk.
On my system, there is an AUD.ini file under a "Sonar Platinum" folder and another one under a "Cakewalk Core" folder. Rename it rather than delete it. I , personally would turn off before doing the AUD.ini thing.