My problem involves my fender Hwy 1 P bass. When I first plug in and play the volume is very quiet then within a matter of seconds fades away completely . Its not the amp or cables, and I my fender Jazz Geddy Lee works perfectly fine. I'm guessing the volume pot? I don't know the things brand new.. frustrating, Thanks for any input. Btw sometimes it will not fade but play at a very very low volume