I have just tested {VolumeMute} and it works absolutely perfect for me. Your job should probably look like this:

Send Keys: {VolumeMute}{Delay 15000}{VolumeMute}

I'm afraid it doesn't work for me. I have three steps in the Job Designer:

Send Keys
Send the following keystrokes {VolumeMute} to the active window

Wait
Wait for 5 seconds

Send Keys
Send the following keystrokes {VolumeMute} to the active window

Should this look different? Or is there some other way I should be doing this besides the Job Designer?

 You can use an external solution. There is a small application that allows you to perform the mute sound operation. Check this article. You do not have to assign a hotkey to it, just download the small application and create a job that will "Run Application" with the specific arguments that are described in the article.

D.M.Altizer,

The below also worked on my pc:

Send Keys: {VolumeMute}{Delay 15000}{VolumeMute}

Question

1.  Where are special key values listed in documentation or actions ? ... I can not find any help/documenation listing indicating that the special key values of  {VolumeMute}  or  {Delay 15000} (and what their function is) can be placed in the Send Keys Action

2.  Also, are there other special key values, that can be placed in the Send Keys ?

 @JosephB:

- Regarding the delay, I have found it here.

I did not know about the VolumeMute either. I just use the Macro Recorder and press various buttons in my keyboard to see how they are "translated" into WinAutomation actions. I am guessing that these buttons are not documented because not all keyboards have them and if the keyboard does not have the button, it cannot be sent properly.

- Besides the keys that you can find by using the Macro Recorder, a very interesting technique to avoid copying and pasting the same keystroke over and over can be found here.