Each channel in this presentation is individually volume-adjustable by tabbing to it, and pressing Alt+Up-slash-Down. You can also mute and unmute each channel at will by tabbing to the one you wish to toggle and pressing Alt+U.
The YouTube-like play-bar at the bottom is made up of two overlapped, slide-width rectangles, one red, the other grey; and both with a Linear-Down (Dark) gradient. The red one flies in from left, and the grey one flies out to right.
The white play-head rectangle is simply a one-inch by one-inch square. (This is a thirty-two-inch--by--eighteen-inch slide.) This play-head shape uses a simple Right Motion-Path, from inch Zero to inch Thirty-One-Point-Five. Did you know you can turn on the PowerPoint Grid to make exactly-measured animations snap to the desired location without any fuss?
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