/usr/lib/plainbox-provider-checkbox/bin/alsa_record_playback is in plainbox-provider-checkbox 0.25-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
OUTPUT=`mktemp -d`
gst_pipeline_test -t 5 "autoaudiosrc ! audioconvert ! level name=recordlevel interval=10000000 ! audioconvert ! wavenc ! filesink location=$OUTPUT/test.wav"
aplay $OUTPUT/test.wav
rm $OUTPUT/test.wav
rmdir $OUTPUT
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