Roland CPM-300 Owner's Manual page 19

Anti-Feedback Function is not working.
@Make sure the ANT] FEEDBACK ON/OFF switch is not set to OFF.
@Anti-Feedback function cannot operate if Anti-Feedback Filters have not been set (AUTO SET indicator extin-
guished). Check the status of all devices (raise the CPM-300's faders, switch on mics, and so on), then run the Anti-
Feedback function's Auto Adjust again.
Feedback cannot be eliminated.
@Moving a microphone after the Anti-Feedback Filter settings are completed creates the chance that feedback will
again become a problem. Run the Auto Adjust with mics in the positions where they will be used during the perfor-
mance.
@1f extraneous sound is allowed to enter the mic during the Auto Adjust process, the threshold where feedback
begins cannot be properly detected.
@Feedback is supposed to occur during Auto Adjust; this is not abnormal.
@The AUTO SET indicator goes out if the Anti-Feedback Filters are not set (have not been used), for example, when
the faders are lowered during the Auto Adjust process. When the AUTO SET indicator goes out, with feedback no
longer being eliminated, then after resetting each device (raising the CPM-300's faders, turning on mic switches, and
so on), run the Auto Adjust procedure once more.
@The Anti-Feedback functions are effective only on the mono Channels 1-6. Furthermore, the Anti-Feedback func-
tions are not effective on signals from any mono Channel 1-6 that has been routed through the internal digital
reverb by means of the channel SEND knobs and MASTER Section's SEND knob.
When Anti-Feedback function cannot eliminate feedback while the internal digital reverb is in use, then with the
digital reverb LEVEL knob rotated completely counterclockwise (-infinity: no digital reverb applied), check the fol-
lowing.
If feedback is suppressed:
The feedback is caused by the signal sent to the internal digital reverb. The Anti-Feedback function is not
applied to this signal. Lower the send levels somewhat with the mono Channel 1-6 SEND knobs and the MAS-
TER SEND knob, and rotate the digital reverb LEVEL knob completely counterclockwise (no digital reverb
applied) to prevent feedback from occurring.
If feedback is not suppressed:
This feedback cannot be removed with Anti-Feedback function. After redoing the settings for each device, run
the Auto Adjust Function once more.
@in some cases, due to certain device conditions and settings, feedback may not be completely eliminated.
The signal from Channels 1-6 is not output properly
@Switching the Anti Feedback ON/OFF switch to ON sends the signal input to Channel 1-6 to the Anti Feedback.
To prevent change in the sound quality of electronic musical instruments, CD players, and other such devices
resulting from application of the Anti-Feedback function, connect devices other than microphones to Channels 7-8
and 9-10.
Oscillation in the sound occurs during recording.
@ Returning the output of the recording device while recording may cause unwanted oscillations in the sound.
During recording, completely lower (set to infinity) the fader for the input channel connected to the output of the
recording device.
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