I was able to switch to spice console . Details here :-
http://bderzhavets.blogspot.com/2015/06/enable-dashboard-spice-console-in-rdo.html

Then I  manually patched virt/libvirt/config.py and driver.py  following :-
http://www.slideshare.net/YukihiroKawada/rdo-spice

I got cut&&paste feature for spice console to VM opened via virt-manager either spicy.
But , regardless in virt-manager's panel showing features I see sound "ac97"  ,
movies are running silently.

Thank you
Boris