This one came into our shop via trade.  The pedal is very clean and operates perfectly.  Get your Freq on!

From Digitech:

Digitech FreqOut natural feedback creator feedback generator effects pedal creates natural feedback at any level with or without distortion 7 harmonic feedback types true bypass controls for onset and gain 7-way type rotary switch to select between 1st 2nd 3rd 5th Nat-Low nat-hi and sub feedback types momentary toggle switch for selecting between latching and momentary mode of the footswitch dry toggle switch for switching the dry signal on/off bypass footswitch 6.3 mm mono IN/OUT jacks status LEDs metal housing power supply via optional 9V DC adapter (not included)