User Manual

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8: SYBIL Evo
VARIABLE FREQUENCY DE-ESSER
SYBIL Evo is a digital equivalent of a traditional
vocal de-esser. When recording spoken or sung
material, the sibilant sounds (Ss, Ts, CHs, and
SHs) in the track sometimes (depending on the
individual performer) appear louder than the rest
of the signal. The effect can sound unnatural and
often irritating. The solution to this problem is to
compress only the sibilants, thereby lowering
their level relative to the rest of the track.
Processing a signal this way is called de-essing.
The diagram below shows how a compressor
and a high pass filter are traditionally configured to
accomplish de-essing.
SYBIL Evo uses a digital algorithm to implement
the de-esser function. While the details of the
algorithm are quite complex, the resulting effect is
functionally equivalent to the diagram above.
COMPRESSOR
IN
IN OUT
OUT
SIDECHAIN
INPUT
HIGH
PASS
FILTER