<s>
An	O
audio	B-Algorithm
leveler	I-Algorithm
performs	O
an	O
audio	B-Algorithm
process	I-Algorithm
similar	O
to	O
compression	O
,	O
which	O
is	O
used	O
to	O
reduce	O
the	O
dynamic	O
range	O
of	O
a	O
signal	O
,	O
so	O
that	O
the	O
quietest	O
portion	O
of	O
the	O
signal	O
is	O
loud	O
enough	O
to	O
hear	O
and	O
the	O
loudest	O
portion	O
is	O
not	O
too	O
loud	O
.	O
</s>
<s>
Levelers	B-Algorithm
work	O
especially	O
well	O
with	O
vocals	O
,	O
as	O
there	O
are	O
huge	O
dynamic	O
differences	O
in	O
the	O
human	O
voice	O
and	O
levelers	B-Algorithm
work	O
in	O
such	O
a	O
way	O
as	O
to	O
sound	O
very	O
natural	O
,	O
letting	O
the	O
character	O
of	O
the	O
sound	O
change	O
with	O
the	O
different	O
levels	O
but	O
still	O
maintaining	O
a	O
predictable	O
and	O
usable	O
dynamic	O
range	O
.	O
</s>
<s>
A	O
leveler	B-Algorithm
is	O
different	O
from	O
a	O
compressor	O
in	O
that	O
the	O
ratio	O
and	O
threshold	O
are	O
controlled	O
with	O
a	O
single	O
control	O
.	O
</s>
