I just picked up my new C-5 cort bass on thursday. I tend to favor the neck pickup on my passive basses a bit more so i went and turned down my bridge pickup a little. When I did this I got a rather odd sound. As if I was playng through a opened wah pedal. I then turned it back up and it was gone. It happens when Iturn down either pickup. It is really cool cause Iuse it for effects in some songs we play buy i am curious as to why it is doing this and if it is suppose to. It is a really cool effect when I play a note and turn the volume up and down as I let a note ring out.