<s>
An	O
effects	B-Protocol
loop	I-Protocol
is	O
a	O
series	O
of	O
audio	O
effects	O
units	O
,	O
connected	O
between	O
two	O
points	O
of	O
a	O
signal	O
path	O
(	O
the	O
route	O
that	O
a	O
signal	O
would	O
travel	O
from	O
the	O
input	O
to	O
the	O
output	O
)	O
;	O
usually	O
between	O
the	O
pre-amp	O
and	O
power	O
amp	O
stages	O
of	O
an	O
amplifier	O
circuit	O
,	O
although	O
occasionally	O
between	O
two	O
pre-amp	O
stages	O
.	O
</s>
<s>
The	O
two	O
principal	O
uses	O
of	O
effects	B-Protocol
loops	I-Protocol
are	O
in	O
recordings	O
and	O
in	O
instrument	O
amplifiers	O
.	O
</s>
<s>
There	O
are	O
two	O
main	O
advantages	O
of	O
an	O
effects	B-Protocol
loop	I-Protocol
.	O
</s>
<s>
Most	O
guitarists	O
use	O
floor	O
pedal	O
effects	O
between	O
the	O
guitar	O
and	O
the	O
amplifier	O
,	O
or	O
they	O
use	O
rack	O
effects	O
through	O
the	O
amplifier	O
effects	B-Protocol
loop	I-Protocol
.	O
</s>
<s>
Some	O
amplifier	O
manufacturers	O
have	O
been	O
including	O
a	O
level/gain	O
control	O
with	O
the	O
effects	B-Protocol
loops	I-Protocol
to	O
allow	O
for	O
the	O
use	O
of	O
floor	O
pedals	O
through	O
the	O
effects	B-Protocol
loop	I-Protocol
,	O
rather	O
than	O
in-line	O
between	O
the	O
guitar	O
and	O
amplifier	O
.	O
</s>
