Hello, Crossover games 9.0 has a sound problems with Oblivion at the main menu. You have two choices.
First, upgrade to Crossover Games 9.1.
Second, keep Crossover Games 9.0, but follow these steps.
• Locate your oblivion.ini in spotlight (Documents > My Games > Oblivion > Oblivion.ini).
• Open up oblivion.ini in textedit or unicode (or any 3rd party program of your choice)
• In the search bar type in copy paste these entrys and change them as showed.
• "SEARCH"
bForce1XShaders
bSaveOnInteriorExteriorSwitch
bUse Joystick
bMusicEnabled
"REPLACE"
bForce1XShaders=0
bSaveOnInteriorExteriorSwitch=0
bUse Joystick=0
bMusicEnabled=0
Let me know if you are having any other problems or can't find something.