[ecasound] RMS Compressor for offline tuning

hello Richard, hello Ecasounders!

i'm using ecasound version 2.4.4 on mac os x for automated offline
tuning - i.e. *not* realtime. therefore i've been trying to use your
computer music toolkit (cmt) v1.15 [1]. i would like to implement its
rms compressor with the following settings:

--
#!/bin/sh
INPUT_FILE=$1
OUTPUT_FILE=$2
COMP_THRESHOLD= (RMS value of input.wav) - 10 dB # ???
COMP_RATIO=0.125    # 8:1
COMP_ATTACK=0.005   # 5ms
COMP_DECAY=0.05     # 50ms
COMP_INPUT=1
COMP_OUTPUT=1
ecasound -i $INPUT_FILE -eli:1073,$COMP_THRESHOLD,$COMP_RATIO, 
$COMP_ATTACK,$COMP_DECAY,$COMP_INPUT,$COMP_OUTPUT -o $OUTPUT_FILE
--
what's the proper setting for COMP_THRESHOLD if this threshold should  
be 10 dB under the RMS value? can i run this compressor in one step  
or do i have to get the RMS value first?
thanks - denis
[1] Simple Compressor (RMS Envelope Tracking) - see http:// 
www.ladspa.org/cmt/plugins.html
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