Yamaha AG-Stomp Owner's Manual page 16

Using the AG-Stomp
G Feedback Reduction
The AG-Stomp is equipped with a Feedback Re-
duction Function to prevent feedback.
Feedback is caused when a certain frequency or
frequencies of the amplified sound causes the gui-
tar to resonate thereby being re-amplified until a
steady howl or whistle is heard.
The AG-Stomp prevents feedback from occurring
by means of a notch filter, which is used to cut the
problem frequency. The AG-Stomp provides a total
of five notch filters (1-5) that can be applied and
operate simultaneously.
[Procedure]
The AG-Stomp provides two ways to set Feedback
Reduction.
• AUTO Setting
When feedback occurs, press the BANK switch.
The AG-Stomp will automatically identify the
problem frequency and apply an available notch
filter.
* The DEPTH is set to its maximum value (knob 10: -20dB)
in the AUTO setting.
* When feedback occurs with chords, etc., the AUTO setting
might not provide adequate performance. In this case, use
the MANUAL setting as described in the next section.
• MANUAL Setting
Press one of the [FEEDBACK REDUCTION]
buttons 1-5 (its lamp will flash). Use the FREQ
knob to select the frequency that needs to be
cut, then use the DEPTH knob to adjust the
amount of reduction needed.
Signal Level
16
Amount of reduction
Frequency
that needs
to be cut
Frequency
After adjustments have been made, press the
same button to set the setting (the lamp will light
and the filter will be active).
To deactivate (lamp OFF) an active filter (lamp
ON), press and hold the button of the filter you
want to deactivate until "
display.
* Refer to the "EFFECT FUNCTIONS and PARAMETERS"
section (page 21) for more information on settings for each
of the Feedback Reduction's knobs.
If feedback is continuously occurring at a
high volume level, it may cause damage
to equipment. Please use caution.
Depending upon Utility Mode settings, Feed-
back Reduction settings are either included
PrG
with patch data (
patch data so that the same Feedback Re-
duction settings/parameters will remain ac-
GLb
tive ( ) even though a different patch is
selected. (→ page 27)
GLb
Also, if the " " (global) setting is used in
the Utility Mode, Feedback Reduction set-
tings will be stored as global data when patch
data is stored so, the settings will be erased
if the power is turned off before the settings
are stored.
When another patch is selected, any set-
tings that were changed will be returned
to their original condition. If you want to
keep the changes you made to those set-
tings, use the Store Operation described
on page 19.
OFF
" appears in the
) or, kept separate of