Randall RM100 Owner's Manual - page 8

MTS Series

EFFECTS LOOP Operations

The MTS effects interface is the most versatile loop system you will find anywhere.  There are two totally ndepenent loops, each

optimized for specific functions and applications.

1) SERIES LOOP:

Basically an insert patch point.  When an external effect is patched into the send and return jacks, the path is interrupted

and 100% of the signal is routed through the effect.  This puts some special demands on the effects unit. It must be essentially

transparent, meaning, it shouldn’t “mess” with your tone.  The input and output levels must be properly set for maximum       head-

room and lowest noise and it needs to operate at line level.  Proper setting of the levels can be achieved using the following

method.

a) Set your amp/preamp volume levels for mormal playing levels.  Connect a high quality instrument cable from the series loop

send jack to the effect input.  

b) Adjust the effects unit input level to “just peak” while playing your most aggressive licks.

c) Now connect another high quality instrument cable from the series return loop jack to the effect output. 

d) Adjust the effects unit output level to the match the volume you heard before connecting the return cable. You can check this by

pulling the cable in and out of the return jack while playing and verifying there is no substantial volume difference.  this is called

“UNITY GAIN”.  

2) PARALLEL LOOP:

This is a more specialized loop.  It has the advantage of maintaining your dry signal (it doesn’t mess with your tone), while

allowing you to mix in the amount of effect you want.  The MTS parallel loop is a bit different.  Most parallel loops found on guitar

amplifiers have a wet/dry mix control that turns down the dry signal (messing with our tone) while simultaneously turning up the

effects level.  Our MTS parallel loop is unique because it never messes with your dry tone, and simply mixes in the amount of

effects using the effect knob on the front panel.  Much like the effects buss on a mixing console.  The direct signal remains

unaltered and the effects are simply mixed back in.  There area few basic rules that must be adhered to and this also puts some

limitations on the uses for the parallel loop.

a)Your effects unit must be set for 100% wet.  This means set the mix levels on the effect so that there is no dry signal passing

through the unit.  Think of the mixing console again.  You would not want to have any dry sigal going though the effects buss

because you would then be mixing in not only the effect but also the unwanted dry signal the comes out of the effects unit.