Daniel: Yes there are "multiple audio deveces" see list posted Mar 12 06:36 above. I have by now tried many possible combination which has included:
1} AUDIO CONTROL:
audio/ input settings output settings
voice/ input settings output settings;
file preferences settings,
active device settings,
Audio Engine Options settings;
sliders mute and monitor settings,
Sample rates settings,
DIRECTWIRE signal patching;
of four channel INPUT, MME, WDM, ASIO, GSIF codec
REALTEK AC97 control pannels for:
One clue is the Realtek AC97 control panel indicates the Stereo Mix slider is closed and refuses efforts to open it and is permanently selected.
Another clue is that Sibelius locks up when Soundforge attempts to record its output.
Another clue is that Realtek AC97 SPDIF slider is greyed out.
This is what leads me to believe that there is something that is being done by Sibelius that effects the Juli@ and Realtek sound devices.
I now think that if there is a solution it may rest in the BIOS setup of the computer and being reluctant to mess with updating the BIOS and all the headaches it can cause I shall have to contend myself with KontaktPlayer2 output for Sibelius until such time as Soundforge is set up on another computer to enable the feed of the Roland synth audio to be recorded into a wave file. This is probably the simplest solution to the no Sound in Sibelius when diving MIDI to an external synth.