The effects loop and mix pot is actually the first part of the S80's master control section.

There are two main advantages of an effects loop.

The Slavemaster also has a dual identity as a second, independent effects loop.

A new feature addition was a crude insert-style effects loop.

There are also three external mixer inputs for effects loops or other sound sources.

Effects loop and output sections are also tube driven, but share circuitry.

They also had an effects loop and reverb, also a first for Marshall.

The amp also features 2 parallel effects loops and a noise gate.

The effects loop can be bypassed with a footswitch.

Effects loops, which are normally wired as patch points.

Each patch can contain up to ten effects, plus whatever's in the external effects loop.

Moving to the front panel, sitting among the other controls on this two-channel combo is the effects loop.

Adam runs these pedals right into the front of the amplifiers as opposed to in the effects loop.

Personally I prefer effects loops and line links to be situated at the back of an amp.

There is one effects loop post preamp with a control for adjusting between serial and parallel operation.

Electronic special effects employing effects loops can artificially reproduce this as well.

Dumble also made a tube-buffered external effects loop called a Dumbleator.

The two principal uses of effects loops are in recordings and in instrument amplifiers.

It's certainly the way to mix effects, help an inefficient effects loop and even expand a basic recording setup.

MkII versions are now available, these add a middle control to the clean channel, and have a more transparent effects loop.

The IIC+ also had an improved effects loop.

There are two speaker outputs, plus an effects loop and 'line in' and 'amp in'sockets.

I'd assumed it would be bristling with DI sockets, speaker outputs, effects loops etc, but not so.

The back panel has outputs for the effects loops, speaker outputs and two separate triode/pentode switches.

The Mark IIB is credited as the first guitar amplifier with a tube-buffered effects loop.