Lexicon MPX G2 - Manual (Page 50)

3-15
Editing
The Infinite Echo program is an analog tape delay effect with auto ducking and
infinite feedback. It demonstrates the routing techniques used to create an
analog feedback path. This unique feature of the MPX G2 makes it possible to
recreate the sound of classic analog delay, chorus and flanger effects.
The guitar signal is routed through the Delay block, which is loaded with
Echo(M). The Delay block output is connected to the Gain block. Here the
Overdrive effect is used to impart the tone and distortion characteristics of the
preamp in a vintage analog echo effect. The Gain block option is set to Split. The
upper path is used as the “normal” path to the Main Outputs. The Reverb block
is placed on this upper path to add some Hall reverb to the overall sound.
The lower path is used as a feedback path to the Delay block. It consists of a
detuner, compressor and volume control, in series. The feedback path is created
by setting the Delay effect Fbk Insert parameter to Effect 2. (Be sure to read
about this option of the Fbk parameter in the Delay Effects portion of Chapter
7:The Effects and Parameters.) This creates a feedback path that flows from the
ouput of Effect 2 back into the Echo(M) effect. The master level of the signal is
controlled by the Echo(M) Fbk parameter. All of the blocks between the Delay
and Effect 2 blocks are also in the feedback path. Every time the Echo repeats,
the signal recirculates through the analog Gain block as well as the Detuner and
Compressor.
The volume control is set to Off, so no audio from this path is passed to the Main
Outputs. Also, the program is stored with the Insert bypassed to keep the guitar
amp preamp out of the feedback loop in Amp Input and FX Loop applications.
These tricks allows the program to be used whether connected for Stand Alone,
Amp Input Only or Amp Input & FX Loop applications.
Infinite Echo Routing Map
Example 3:
Program 219 Infinite Echo
(Stand Alone)