A/DA APP-1 User Manual - page 5
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Modes of Operation
1.
PREAMP + BOOST with the dual buffered FX LOOP
2.
PREAMP + BOOST
3.
BOOST with the dual buffered FX LOOP
4.
BOOST only
5.
TUNER MUTE ‐ this silences everything except the signal
to your tuner, which is plugged into the back panel of the
APP‐1
6.
TRUE BYPASS (Hardwire bypass) This also disconnects
the TUNER from your guitar’s signal. The guitar’s signal is
buffered and then sent to the TUNER jack is only
connected in the IN mode and TUNER MUTE mode.
By switching the FX LOOP in and out, the user can adjust any gain
loss from the effects in he signal chain with the FX LOOP RTN LEVEL
pot. Also when the FX RETURN jack is unplugged, the signal path is
normalized, meaning the FX LOOP RTN LEVEL pot is out of the path
and the path gain is equal to 1.
The BOOST circuit is post MASTER, so the level of the MASTER is
always boosted proportionally up to +16dB of additional gain.
Optimizing Signal Levels
Today’s pedal boards are heavily populated with all kinds of effects
by players seeking to sculpt their special, often unique tone, and
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typically a chain of a half dozen to a dozen stomp boxes. Having so
many pedals usually results in a loss of signal level and integrity, and
most often a signal path far from optimized. The A/DA APP‐1’s
effects loop has a low impedance buffer driving the effects loop and
a high impedance buffer to recover any losses in the effects chain.
The recovery buffer won’t color your signal and has an adjustable
level to return the same signal level that drives the effects chain.
Using the FX LOOP IN/OUT switch, you can “A‐B” your effects
individually or in a chain to check their signal levels and, using the
APP‐1’s FX LOOP RTN LVL (Return Level) trimpot, balance and
optimize the signal coming from your effects pedals. This will
increase headroom, lower noise and provide seamless switching of
your individual effects without jumps in signal levels.
A step‐by‐step
procedure is available online under APP‐1 Tips and Settings.