Using
the
Feedback
Suppr
essor
ZOOM 504 II
ACOUSTIC
19
Using the Feedback Suppressor
Using
the
Feedback
Suppr
essor
18
ZOOM 504 II
ACOUSTIC
The 504 II incorporates an F.B.SUPPRESSOR that serves for reducing
acoustic feedback by cutting a specific frequency range (feedback
frequency). The F.B.SUPPRESSOR can be used in play mode or edit
mode.
Using F.B.SUPPRESSOR in play mode
If feedback occurs while playing the instrument, the optional foot
switch (FS01) connected to the CONTROL IN jack can be used to
automatically detect the feedback frequency.
1.
Insert the plug of the FS01 into the CONTROL IN jack of
the 504 II, then turn power to the 504 II on.
If the FS01 is plugged into the CONTROL IN jack while the 504 II is
already on, malfunction may occur. Be sure to turn on the 504 II only
after connecting the foot switch.
2.
Set the [PLAY/EDIT] selector to
"F.B.SUPPRESSOR".
3.
Use the [+]/[-] keys to change the display
indication to "SC".
"SC" is the attenuation setting value based on
automatic detection of feedback frequency.
Automatic detection starts when the
F.B.SUPPRESSOR parameter is set to "SC" or set to
off and then on again.
When wishing to retain the "SC" setting also while
the unit is turned off, store the currently selected
patch.
4.
Return the [PLAY/EDIT] selector to "PLAY".
5.
If feedback occurs during play, press the
FS01 twice.
F.B.SUPPRESSOR is switched on/off and the 504 II
automatically detects the feedback frequency for
attenuation.
Using F.B.SUPPRESSOR in edit mode
The following method allows finding the feedback frequency in edit
mode, either automatically or manually.
1.
If feedback occurs while playing the
instrument, set the [PLAY/EDIT] selector to
"F.B.SUPPRESSOR".
The 504 II switches to the edit mode.
2.
Use the [+]/[-] keys to change the display
indication to "SC".
If "SC" is already set, change the value and then
select "SC" again, or press both [ ]/[ ] foot
switches (or the foot switch FS01 connected to the
CONTROL IN jack) twice, to switch the
F.B.SUPPRESSOR parameter off and then on again.
3.
If feedback is not satisfactorily reduced by
step 2, set the F.B.SUPPRESSOR parameter
to a value between 1 - 30 that yields the best
reduction.
When wishing to retain the F.B.SUPPRESSOR
parameter setting also while the unit is turned off,
store the currently selected patch.
NOTE
FS01
