I have been able to install iDeneb 10.5.8 on my AMD based PC

now I want to configure Audio onboard: Realtek ALC 889A

I run on this hardware:
cpu: AMD Phenom II x4 965 BE 3.4 GHz
Motherboard: Gigabyte GA-MA785GPMT - UD2H
Video onboard: Ati Radeon HD 4200
Audio onboard: Realtek ALC 889A
RAM: 4GB
Network Card: 8111c (chip 8196 / 8111)
Wireless Card: Wireless Ralink RT 2760 / RT 2720

how should I do this? where can I fin this driver?

Installation report

thanks in advance