I have debugged this with Lennart today at the boston summit, and we
have pinpointed the problem: alsa/udev is overriding pulseaudio.

This file in particular: /lib/udev/alsa-utils

Whose contents are:

#!/bin/sh -e
# udev script for alsa-utils
(
        DEV_BASENAME="${DEVNAME##*/}"
        N="${DEV_BASENAME#controlC}"
        exec /sbin/alsa-utils start $N
) &


...If we disable that file by replacing the contents by:

exit 0;


It works. The microphone's sound level is remembered no matter how fast/how 
many times you unplug/replug.

This is an Ubuntu-specific bug.

-- 
recording volume is randomly reset
https://bugs.launchpad.net/bugs/527866
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