I offered to replace the volume pot on a Warwick Corvette for a student. He complained that the volume control had no effect over most of its range, and changed radically at the very end. I thought it might be a linear taper pot, so I put in a replacement 500k ohm audio taper pot. The same thing happened, however. There is a noticeable click just below the full-on position. Have any of you experienced this? I don't think it's the pot, which is brand new. Could it have something to do with the blend pot? Any advice or insight would be appreciated. Thanks!