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Using the Feedback Control
ZOOM A2.1u
21
Automatic detection of
feedback frequency
The A2.1u can automatically detect the frequency
range where acoustic feedback is occurring. If
acoustic feedback should suddenly develop
during a performance, you can simply hit the foot
switch to turn the function on and suppress the
feedback sound. This is possible both in play
mode and manual mode.
1.
Refer to the section "Manual
operation of feedback control" and
set the FEEDBACK FREQ value to
"oF" or "At".
When you select the "oF" setting for the
FEEDBACK FREQ value, the feedback control
function is off, but it can be turned on by pressing
the [Q
] foot switch (in manual mode only) or an
external foot switch. The setting will change to
"At" and feedback frequency detection starts
automatically.
When you select the "At" setting, the feedback
control function is on. In this condition, pressing
the foot switch twice initiates automatic detection
of feedback frequency.
HINT
In manual mode, you can change the FEEDBACK
FREQ value by turning parameter knob 1.
2.
To automatically detect the feedback
frequency while playing your guitar,
proceed as follows.
■
In play mode
Use an external foot switch (FS01) connected
to the [CONTROL IN] jack. Set the function to
be controlled by the foot switch to "Fb"
(feedback control on/off) (
→
p. 25). Press the
foot switch to turn feedback control on.
NOTE
If no external foot switch is connected, automatic
detection of feedback frequency in play mode is not
possible.
■
In manual mode
Press the [Q
] foot switch to turn feedback
control on.
In either case, automatic feedback frequency
detection starts when the function is turned on.
The indication "SC" appears on the display.
To repeat the automatic detection process, press
the [Q
] foot switch (in manual mode) or the
external foot switch twice to turn the feedback
control function first off and then on again.
Automatic detection will then be performed once
more.
HINT
• You can use built-in expression pedal to adjust the
feedback control frequency with your foot (setting
range 1 – 30). For details, see the following section.
• For information about making foot switch or pedal
settings, see pages 30 – 38.
O F
SC
eA21u.fm 21 ページ ２００５年１１月４日 金曜日 午後５時２３分