Audio volume low after wake-up

After I wake the Mac from sleep, the audio volume from my external speakers is very low and the keyboard volume controls do not work. The volume is low and cannot be adjusted.
After a restart everything works correctly -- until the Mac goes to sleep again.
Computer: Mac Pro - late 2013 - 6,1
System: OS X Yosemite (10.10.1)
Speakers: Bose Companion 2 Series II (plugged into audio output of my Mac Pro)
Thank you for any help you can provide.
John
Mac Pro (Late 2013), OS X Yosemite (10.10.1), Thunderbolt Monitor

Thank you, lllaass, but it was to no avail. The problem persists: When the Mac wakes from sleep the audio from the external speakers is low and cannot be adjusted up or down using the keyboard volume controls.
I did some more research and others are apparently having the same problem. One suggestion I found does work -- temporarily. That is entering a Terminal command (sudo killall coreaudiod) that restores correct audio function. Unfortunately once the Mac goes to sleep again the command must be reentered again. But at least it saves a full restart.
Hopefully Apple will issue a solution to this issue.
Thanks again!

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I've been having an issue ever since I upgraded to OS X Yosemite, where the audio volume coming out of my external speakers is extremely low after I wake my computer up from sleep. The only resolution I have found is restarting the computer. Once I do that, the audio volume is great. If I were to boot up my computer after it has been completely shut down, the audio volume is also great. The issue only occurs after sleep. Anyone else having a similar issue? Is there another fix besides restarting the computer?
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This is a BUG. It has been submitted to engineering many times - unfortunately Apple has not done anything about it.   We have 5 Mac Pros, all 5 do the same thing after updating to Yosemite.   The PRAM / SMC reset is useless - we even installed a fresh OS on one of the machines (a suggestion of the level 2 Apple tech) same problem.   Clearly this is a system level bug.   Only way to get it resolved is to keep pounding the bug report site with requests.     The squeaky wheel gets the oil.   The problem is 100% repeatable on the machines that exhibit the bug.
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This is a BUG. It has been submitted to engineering many times - unfortunately Apple has not done anything about it.   We have 5 Mac Pros, all 5 do the same thing after updating to Yosemite.   The PRAM / SMC reset is useless - we even installed a fresh OS on one of the machines (a suggestion of the level 2 Apple tech) same problem.   Clearly this is a system level bug.   Only way to get it resolved is to keep pounding the bug report site with requests.     The squeaky wheel gets the oil.   The problem is 100% repeatable on the machines that exhibit the bug.
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@Re: X-Fi Xtreme Audio - Volume goes low, static, then comes backu Hi
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Audio volume low after wake-up

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