NO Audio Volume Control with Asus Xonar D1 (1 Viewer)

[lhcomputer]

MediaPortal Version: Mediaportal 1.1 RC5
MediaPortal Skin: Black Glass Nova
Windows Version: Win 7 Home Premium 64 Bit
CPU Type: AMD X2 235E
HDD: 1 TB WD Green Power
Memory: 4GB
Motherboard: Gigabyte A785 Chiprsatz
Video Card: ATI HD 5450 passiv
Video Card Driver: Catalyst 10.3
Sound Card: Gigabyte
Sound Card AC3: Asus Xonar D1
Sound Card Driver: newest from the Homepage, PCI_D1_100407_7_12_8_1780_W7
1. TV Card: KNC One
1. TV Card Type: DVB-c
1. TV Card Driver: ???
2. TV Card: NO
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: SAF 5
MPEG2 Audio Codec: SAF5
h.264 Video Codec: Power DVD Ultra 9
Satelite/CableTV Provider:
HTPC Case: ANTEC Fusion 2
Cooling: Arctic Cooling
Power Supply: Be Quit
Remote: Microsoft MCE Fernbedienung
TV: Samsung 46" Full HD Serie 7
TV - HTPC Connection:

It´s not possible the Audio Volume Control (like MP3) about Mediaportal. Analog Audio Out
Other Volume Control Video, TV and so on its OK. The Same Situation without Asus Xonar (On Board Realtek Sound)
Volume Control is OK

Play an Audio File in Mediaporta Windows the Volume Control under Windows is possible.

The Same Problem: Play Blu Ray under Power DVD 9 Ultra (without Mediaportal) . No Volume Control.
Forum Recherge say thats the Volume Control under Power DVD 10 is OK.

Sorry for the bad English

A.Herberg