Sound for the XRP on ramp videos?

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IntroToRoboticsV2/course/driving/understanding_your_robots_drivetrain.rst

Line 90 in c1de0c9

.. youtube:: z6aIVpf3qN0

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Third-grade students in our elementary school robotics club cleverly used the sound of a motor to help them understand responses of dc motors to varying loads. So, when I saw this pair of videos contrasting XRP responses to varying loads, I wanted to see whether I could hear the differences there, too. But I could find no audio for either video. Is that intentional? Seems to me to be a missed opportunity.