Hi Vincent,
I am sorry for not posting earlier but a health problem of my father kept me in hospital during the weekend.
So the problem was solved after all after selecting a different output in Control Panel for Windows Playback.
As i have mentioned before i was aware of the fact that feeding the same Software Playback Channels with Audio Stream from 2 separate Softwares (Windows and Cubase) at the same time would cause a conflict.
However the problem is that Windows won't see any Software Playback to route its Audio Playback to. Check below a print screen image from my PC in order to have a better view.
As you can see in the Drop List, available Outputs are mentioned as:
HDSP 9632 Analog (1+2)
HDSP 9632 SPDIF
HDSP 9632 ADAT (1+2)
HDSP 9632 ADAT (3+4)
HDSP 9632 ADAT (5+6)
HDSP 9632 ADAT (7+8).
This would make any user to think that choosing any output from above would route Windows Playback to the respective Physical Outputs which is actually very misleading and even more if the user experiences RME equipment for the very first time . Personally i needed to use HDSP 9632 Analog (1+2) so i was obliged to set Windows Playback to that output.
On the other hand setting Hammerfall ASIO Driver as Cubase Master ASIO makes Cubase's Playback to appear in Software Playback Channels 1-2.
Setting Windows Playback to HDSP 9632 Analog 1+2 makes also Windows' Playback to appear on the same Software Playback Output Channel (1-2) so the conflict occurs when both softwares run. Releasing ASIO Driver in background will enable windows playback back but this is not a solution obviously.
When i tried to set Windows Playback to SPDIF i noticed in Total Mix that Playback occured in Software Playback Channels 3-4 which was routed to Physical SPDIF L/R and to Physical Analog 1-2. What i did was to turn the levels of Software Playback 3-4 off (only from Sub Mix of physical SPFIF L/R) so as no signal reached Physical SPDIF Outputs since i won't be using them. Therefore i had Windows Playback appearing in Software Playback Channels 3-4 and Analog Outputs 1-2. Check below.
After running cubase everything worked ok. Cubase's Playback Signal appeared in Software Playback Channel 1-2 which was also routed to Physical Analog Out 1-2. I could hear both Playbacks through my Analog Outputs 1-2 and watch their signals separately in Software Playback channels and added in Physical Analog Outputs 1-2 Channels.
I would like to mention again that i have the most up to date drivers (3.08.5) and firmware version (154).
According to my opinion the way that Outputs are mentioned in Control Panel--->Sound Devices--->Audio--->Sound Playback is very misleading and may confuse people.
I guess that Default Routing which is probably of the following correspondence:
Software Playback 1----->HDSP 9632 Analog 1
Software Playback 2----->HDSP 9632 Analog 2
Software Playback 3----->HDSP 9632 SPDIF Left
Software Playback 4----->HDSP 9632 SPDIF Right
Software Playback 5----->HDSP 9632 ADAT 1
Software Playback 6----->HDSP 9632 ADAT 2
Software Playback 7----->HDSP 9632 ADAT 3
Software Playback 8----->HDSP 9632 ADAT 4
Software Playback 9----->HDSP 9632 ADAT 5
Software Playback 10---->HDSP 9632 ADAT 6
Software Playback 11---->HDSP 9632 ADAT 7
Software Playback 12---->HDSP 9632 ADAT 8
made RME team to program the card so as to mention Physical Outputs instead of Software Playback Outputs in Windows Drop List of available outputs for Audio Streams.
I think that it would be more convenient and clear if Outputs for Audio Playback Streams were mentioned as:
Software Playback Outputs 1+2
Software Playback Outputs 3+4
Software Playback Outputs 5+6
Software Playback Outputs 7+8
Software Playback Outputs 9+10
and Software Playback Outputs 11+12.
Then the user would route those software pairs as per his needs using Total Mix.
Perhaps you may do that by releasing a new driver or a User Guide upadate. It is not necessary for me now but i think that it will help new users of your equipment.