User Manual

Send/Return Jacks for External Effects or Amps
The rear panel send/return jacks are stompbox/instrument level unbalanced connec-
tions that allow you to connect external devices in series with M13 Stompbox Modeler’s
effects. From the SETUP mode, you choose where this occurs in the signal flow: before
all FX Units, inserted between any one of them, or after them all. This setting is stored
as part of each scene, so different scenes can use the send/return differently. And if you
don’t connect to the return, the loop will be ignored, and will not affect the signal flow
(but still sends signal, allowing you to use just the send to feed a tuner).
A typical use would be running one or more external effects in the send/return loop:
How about using some of the FX Units to feed your guitar amps’ input, and others in
your amp’s effects loop? No problem. Let’s have FX Unit 1 and 2 feed your amp’s input,
and put FX Unit 3 and 4 in your amp’s effect loop. First, set the send/return loop to run
after FX Unit 2. Then, hook up like this:
Or for real fun, try splitting effects to 2 separate amps: set the send/return loop to run
after FX Unit 2 and set up as shown next. FX Unit 1 and 2 will feed the first amp, and
FX Unit 3 and 4 feed the second amp: