A/DA APP-1 User Manual - page 7
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1’s OUTPUT jack. If you want to just drive the amplifier, you can do so
by switching the PREAMP + BOOST switch to the right and the FX
LOOP switch to the right, so the only function of the APP‐1 is the
BOOST. If you want BOOST and the FX LOOP engaged, set the FX
LOOP switch to the left and the PREAMP + BOOST switch to the right
position.
Effects Loop (FX LOOP) Setup
The effects loop is a dual‐buffered loop so the signal from the APP‐1
is low impedance capable of driving many effects boxes without any
change in signal integrity. The return signal from your effects chain is
also buffered with a high impedance buffer that has a gain control so
you can balance or bring back any signal loss from your effects chain.
To help setup the FX LOOP properly, the APP‐1 has switch labeled “FX
LOOP” to switch to switch in or bypass the signal through your
effects. This is used to trim the level with the “FX LOOP RTN LVL”
control in order to optimize your signal path and to balance the levels
of the preamp and your effects boxes.
Tuner Out and Tuning
The TUNER jack on the rear panel of the APP‐1 allows you to connect
your Tuner through an isolation buffer so that it never colors or loads
down your guitar signal. It also allows you to tune at any time, and
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by switching the TRUE BYPASS switch to the far right, you can tune
while your stage and house sound is muted.