Log Amplitude Level of Input

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Hello

I would like to log the amplitude level of the Line capture input
every 20 seconds.  This would log a numerical value similar to the
output of "arecord -vv" (a textual percentage VU-meter), "ameter"
(graphical VU-meter for X), or "ecasignalview" (ncurses-based
numerical summary).  Ideally I would like to just "sniff" the device
from a script, thus not actually opening the devices as it may or may
not be open already.  Ideas very welcome.

Thanks!

- pete <><

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