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Some comps have a threshold, and some have no threshold but rather an input knob to determine how much of the signal gets squahsed. Empirical labs distressor is a classic example of a comp with an input gain knob and no threshold knob. The output is a form of "make up gain".
The attack and release times for me are the most important settings.
Unlike automation, a compressor alters the signals ADSR envelope depepnding on the attack and release times you have set which can radiacly change the character of the audio.
Heres a tip I use all the time, in order to hear what the attack knob is doing more clearly, put the ratio really high 10:1 and above, set relase very fast. Make sure you got more than 10 db of gain reduction happening, the more the better in this case. Set the attack to its fastest setting, now play the audio and move the attack knob from fast to slow all the while listening to the front edge of the sound, you may have to crank the monitors a tad while doing this. Its a lot easier to hear the sweet spot like this, then you simply back off all the other settings to where they work for the part/song.
hope that helps, remember, quick release times can cause pumping which sometimes is wanted and sometimes not.
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