dbx AFS2 Owner's Manual page 28

VIRTUAL HIGH PASS [OFF, 30Hz - 500Hz]
This parameter places a high pass filter in the AFS detector path. If you don't want AFS to have the ability to set any filters
below a set frequency (for example, if you don't want AFS to notch any frequencies below 100Hz), adjust this parameter to the
frequency below which you want AFS to ignore.
SENSITIVITY [-6.0 dB to +6.0 dB]
This parameter adjusts the input level feeding the AFS detector and makes AFS more or less prone to mark a signal as
feedback.
When AFS is set to Fixed Mode, SENSITIVITY adjusts the feedback level perceived by AFS. For example, setting SENSITIVITY
to +6 will allow AFS to detect the feedback and notch it out more quickly. Conversely, setting SENSITIVITY to -6 will cause
AFS to be a little more hesitant to set a filter on the feedback until it reaches a higher level.
When AFS is set to Live Mode, SENSITIVITY will work the same way as during Fixed Mode on pure feedback tones, but will
also affect where AFS draws the line between feedback and music. If you find that AFS is being too hesitant to set filters on
feedback during your live performance, try increasing the SENSITIVITY setting. If you find AFS mistaking an instrument for
feedback, try decreasing the SENSITIVITY setting for that channel.
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