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ampeg 4 pro question

Here you go. This is a direct quote from the 4 Pro manual:

MUTE:
Press this switch in to mute all outputs except the tuner outs [2, 49]. The footswitch may also control muting if the mute switch [3] on the front panel is left in the “out” position. (The front panel switch is still active with the footswitch connected. This is excellent for tuning your bass with an electric tuner without having to adjust any levels to turn down the sound). The peak LED [6] will illuminate when this switch is engaged.
 
And I totally forget whether I can use the special bridging cable as a standard use cable or do I have to buy a second one if I'm just running one side of the amp?

That depends on if it's New or just new to you. Read the back of the amp. With the NEW ones there is no need for a special mono-bridge cable. Any normally wired speakon will work.
 
Also, a preemptive suggestion: Make sure you pick your rack very carefully if you intend to rack-mount the amp. The Pro series has vents on the sides; they need side air flow. :)
It came with a 4 space road ready rack case(meh) which allows for side venting. However the damn rack adds 20+lbs to the amp. When I had your old one, I took a 3 space standard skb case, and drilled out about 60 small vent holes under the handle. This worked perfect, even in the hottest temps. Never had an overheating problem with it.

That depends on if it's New or just new to you. Read the back of the amp. With the NEW ones there is no need for a special mono-bridge cable. Any normally wired speakon will work.
New to me. It's a US version.