Rocktron Vendetta 100W 2x12 Combo Amp - Manual (Page 10)

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Effects Loop Operation
The effects loop on the VENDETTA offers two modes of operation, as described below.
Series Mode
When an effect is inserted into the loop send and return jacks, the direct signal path
is interrupted and 100% of the signal is routed through the effects unit. This is the most
common style of effects loop in most guitar amplifiers.
This configuration allows the use of most special effects such as reverb, echo,
chorus, pitch shift, equalizers, noise reduction, etc. The only disadvantage to this loop is
that your TONE may be affected by the effects processor because your signal passes
through it at all times.
Parallel Mode
This the more specialized mode that is limited in its use, but offers the advantage
of leaving your direct signal intact even when an effects unit is inserted in the loop. Your
TONE is not hindered by the effects processor. Think of this mode as similar to the effects
buss on a mixing console. Your DIRECT signal is always present, and the processed
signal is MIXED in using the FXLEVEL/MIX control.
"Time-based" effects are ideally suited for this application. Echo, reverb, delay,
flanging and phasing are all examples of time-based effects.
Processors that WILL NOT function properly in a PARALLEL loop include noise
reduction, equalizers, compressors and limiters. The reason for this is because, for
these devices to work, they MUST PROCESS 100% of the signal. For example, you
cannot equalize the signal if you have the "un-equalized" signal along with it. Makes
sense, doesn’t it?
* When using this mode, you must program the effects unit for 100% wet. You
do not want any dry ( un-effected) signal to be allowed to pass through the
effects processor.