First you must Pin Media Play to the Task Bar:
Easiest way is to select Media Play, from the program list, in the Start menu,
right click on Media Player, and select "Pin to Task Bar"
Once you have it pinned, call up your audio file using media player,
next Reduce Media Player using the underline in the upper right corner.
Now, if you hover over the pinned Media Player icon on the task bar,
you will see you have control over the Play, Pause, Next, and Previous buttons.
Now just call up your Word doc and you should be good to go.