Hi,
in the manual it says at least what the minimum and maximum values stand for(haven't found more- what is kind of strange):
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Compressor:
Threshold (variable) ..............................................................................................................................-40 dBu to +2- dBu
Ratio (variable) ..................................................................................................................................... 1-10 (1:1 to 10:1)
Attack (variable) .......................................................................................................................................... 0.1 to 200 ms
Release (variable) ........................................................................................................................................ 0.05 ms to 3 S
Gain Make Up ........................................................................................................................................ -10 dB to +10 dB
Metering ................................................................................................................... Analog VU (Gain Reduction / Output)