Working Feedback Ferret, in very good condition.

From Peavey website:

How Does It Work?

The Ferret includes a set of 16 digital notch filters that employ sophisticated algorithms that seek out and destroy feedback‚ without destroying your tone. There are two sets of filters on the Ferret‚ static and dynamic. Filters 9–16 are static and always set before the dynamic filters (1–8). Once these static filters are set‚ they lock and maintain their status until they are reset by the user or a different preset is selected. The dynamic filters (1–8) are those filters that change as your needs change. Any filter (static or dynamic) that is set‚ but not locked (as indicated by blinking filter LED)‚ will slowly release and return to flat (0 dB) and be available for further use. When the Ferret locates an offending frequency (feedback)‚ it applies a filter‚ starting with filter 16. This filter is centered at the feedback frequency and uses only as much attenuation as needed to remove the feedback. If feedback continues‚ the filter depth is progressively increased until the feedback is gone. If the feedback is momentary‚ such as a short squeal‚ the Ferret applies a filter but slowly releases it in .10 dB steps until it is returned to flat (0 dB). If the same frequency causes feedback again‚ the same filter will be reapplied. This process continues as additional filters are engaged‚ starting from the right side of the Ferret‚ until all feedback is gone. Monitoring continues as the Ferret attempts to release each active unlocked filter .10 dB at a time. Once a filter reaches 0 dB‚ the Ferret returns the filter to the queue. The Feedback Ferret continuously applies the least amount of attenuation required to eliminate feedback