It appears 17.7.2 killed my audio. Total silence. Luckily I had a two day old Restore Point that fixed the problem by rolling back to 17.4.4. Repaired after two hours of trouble shooting with two other computers off the same AVR. I suggest making a restore point a regular component of these comprehensive updates. I will make this a practice from today forward, or possibly simply refrain from further updates. Restore point analysis noted Vulcan Drivers and one Critical Update as last modifications made. However the sound went out immediately after the Radeon Update today. This is just an FYI - no answer sought.
AMD A10 7890K GByte F2A88XM Win7Pro