Numbers
By default, a video or audio file plays once when you tap the Play button . You can have it repeat in a loop and adjust its volume.
Go to the Numbers app on your iPad.
Open a spreadsheet with video or audio, then tap the video or audio to select it.
Tap , then tap Movie or Audio.
To set media to repeat, choose how you want it to play:
Play in a continuous loop: Tap Loop.
Play forward and then backward: Tap Loop Back and Forth.
Note: Recorded audio can’t loop back and forth.
You can adjust the playback volume of audio you record in Keynote.
Go to the Numbers app on your iPad.
Open a spreadsheet with recorded audio, then tap the audio to select it.
Tap , then tap Audio.
Drag the Volume slider.