Trying to normalize each wav before encoding, with no effect.

For years on Debian [1] and Ubuntu I've had this problem --- grip
ignores (as far as I can tell) whatever I put in the normalize field
of the Config -> Rip -> Options tab.  (My MP3 player is quite loud,
even at the lowest setting, so I want to normalize every track to
-20dB.)

In that box, I've tried "/usr/bin/normalize-audio -a -20dB" as well as
adding the %stuff%stuff.wav stuff to match the ripped filename
specification.  

The commands I'm trying to use work on their own from xterm on the
files, but when I try to normalize tracks within grip the resulting
*.wav and *.mp3 files end up at the unnormalized volume: grip appears
to ignore the command completely.

Does anyone know how to fix this?  I'm quite open to the suggestion
that I'm doing something wrong!

[1]
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=338778


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