[MB-WI]

Disable HTC Sense in the today screen settings, then enable Titanium, or the old 6.1 home screen, then to go to the clock and alarms and enable the setting in the stock WM tab where it was before. Then go back to home screen settings, and re-enable HTC Sense. It appears the setting is still there on the MS end, but HTC did not give you a way to get to it. I did not check what it did to the Registry, but I did verify that it rings in silent and vibrate.