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Feedback Cancel
We’ve made it very easy to eliminate the feedback that typically occurs when you plug in an acoustic instrument.
Here are three ways to use the Feedback Cancel filter.
Factory Default Feedback Cancel
The Feedback Cancel is set up at the factory with a 100 Hz notch filter; the frequency where many
acoustic guitars howl. Simply tap the Feedback Cancel footswitch to engage the filter. If the feedback
does not go away go to “On the Fly Feedback Cancel” (below).
On the Fly Feedback Cancel (Play Mode)
If you are in a program the Play mode and your instrument starts to feedback during a performance, the
Feedback Cancel feature can scan for feedback and then eliminate it as long as you stay in that program.
If you experience feedback, just hold down the Feedback Cancel footswitch for several seconds, until the
LED starts blinking. Release the footswitch and the circuit will seek out the feedback and eliminate it.
Note that once you leave the program, the Feedback Filter will shut off and be cleared from that program.
If you want to save and have instant recall of a Feedback Cancel setting, see Programmable Feedback
Cancel below.
Programmable Feedback Cancel (Edit Mode)
If you want to “Search and Destroy” feedback and then save the setting into a program location,
follow the directions below.
1 Select a program in the Play mode and make note of the number. Move the switch to the Edit
position.
2 Step on and hold down the Feedback Cancel footswitch for several seconds until the LED above the
switch starts flashing. Release the footswitch and dampen the strings with one hand, then raise the
Output Level or your amplifier volume until feedback starts.
3 When the LED stops flashing but remains on, the Feedback Cancel circuit has automatically found
and eliminated the feedback.
4 Move the Edit/Play switch to the Play position to save the Feedback Cancel into the program.
5 Whenever you return to this program, the saved Feedback Cancel filter will engage.
Programmed Feedback Cancel, Normally Off
When you want to have the Feedback circuit dialed in a specific program location, but you want it
“normally off” so you can recall the setting only when you need it .
Follow the above procedure, and then go back to the Edit mode. Tap the footswitch so the Feedback
Cancel LED turns off. Switch back to Play. The saved Feedback Cancel notch in that program location
will now be normally off and you can turn it on by tapping the Feedback Cancel footswitch.
The Feedback Cancel can “remember” different notch filter settings for each of the 50 programs in the
play mode.
Note that Feedback Cancel is not available when the Tuner is engaged.
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Acoustic Imaging Blender
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Inner Workings - continued