frank_1 said:
What the hell is de-esser. All I know is that it is apart of the mastering process.
"a part of the mastering process"? Not usually. Usually it is part of the mixing process.
A de-esser is a compressor to works with a certain frequency, usually in the upper midrange (3-10KHz). If a vocal track has excessive sibilance, this can be addressed with a de-esser, who's job is to turn down ONLY the frequency that the sibilance is at.
I have found that the best way to do this is to use the Side Chain circuit on a compressor and a 31 band graphic eqaualizer. You would run your vocal through the compressor, insert a graphic eq on the side chain circuit, then on the eq, turn up all the way the frequency that the sibilance is at and turn all others down, then set the threshold of the compressor so that the sibilance is reduced by the amount you want. You will want to use a very fast attack setting, and a medium to fast release (fast if very high, medium is lower frequency is the culprit). In doing this, the compressor is ONLY compressing when the sibilance happens and not any other time. In effect, you are turning down the vocal track for only as long as the offending sibilance is taking place, if everything is set right.
Some unit have a "built in" de-esser, but I have found that they don't work all that great, and usually sort of mute the high end in a vocal track.
By the way, a parametric EQ capable of a very tight Bandwidth would be very effective to use instead of a graphic equalizer. In fact, depending upon the offending frequency, it may work better.
Hope this helps.
Ed