Dirt Rally 1.0 - No co-driver sound

[transaxlehomie 0]

Hello, i am new to this game and i have a big issue cause i cant here my co-driver. Is there any setting to toggle this on and off ? I already did some googling, found this issue but no appropriate solution. My HUD shows symbols for the corners but i cant here the voice of my co-driver. I juggled around with speaker settings from simple stereo (my standard) to 5.1 with an additional center speaker. Nothing works 😞

Can someone please point me to a solution, because only relying to the symbols in the HUD is really annoying. THX.

Edit: sorry, i just noticed this is wrong forum, as this is a technical question. Could one moderator please move this ?

BR transaxle_homie