I'm sorry, but your (Kevin Haskin's) response is a bit off.
dB is a relative term.  It is only an ABSOLUTE value when it is related
to some other value.  For example, dBm is with respect to power, with
0dBm being equal to 1 mW.  Sound pressure levels must also have a
standard value, and a related dBx value.
dB, on the other hand, is relative - as in "this signal is 10dB larger
than that one".  A dB volume scale for that reason is a reasonable
request... although the "reference" level is somewhat arbitrary.  If
the maximum level is 0dB, (or 100%), then you could have a volume scale
which reads in -dB values.


-- 
tcutting
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