If you want to change the location that Options>Windows Record Mixer points to, here are the instructions for doing this.
You need to edit the Audition_settings.xml file. Initially, you need to make sure that Audition isn't running before you do this, and you need to know exactly what the full path to your preferred mixer applet is. Then you need to locate the XML file, which will be in
C:\Documents and Settings\{username}\Application Data\Adobe\Audition\2.0[/list:u][/color]and open it in an editor. If you have already got custom settings in Audition, it's a good idea to make a backup copy of the file first, just in case anything goes wrong, and you want to restore them. If you haven't, it doesn't really matter because all you would have to do in the event of getting it wrong would be to delete the file, because Audition would then automatically restore the default version.
Now you need to search in the file for the term 'Mixer2', which is pretty near the end of it. You will find a line that says
<KeyVal Key="Mixer2" Type="String">{the Windows mixer path}</KeyVal> [/list:u][/color]
and you need to replace the Windows mixer path with the path to your own mixer applet.
As an example, my Motu Traveler mixer applet is entered as:
<KeyVal Key="Mixer2" Type="String">C:\Program Files\MOTU\Audio\MOTU CueMix Console.exe</KeyVal>[/list:u][/color]
Now save the file, and restart Audition, and the recording mixer menu item should start the correct mixer app.