I recently purchased a used rocktron chameleon from ebay. I like it alot. But it has a problem now. It just started a couple of days after I started creating a clean channel. Now if I use the on board chorus it creats this noise similar to fretbuzz with out it actually happening. If I mute chorus, the sound goes away. So I know it is the chorus that is the problem. It doesn't happen with the flanger either. Does anyone have any ideas?