When I play my DB, I am getting a strange sound that I would say sounds almost like fretbuzz on a guitar. I have experienced this with electric basses when amplified and the speaker was being choked, however I have neither frets, nor amplification. This happens on predominantly my A string, and the E slightly less. I don't notice it as much on the D & G. It happens whether open or fingered. The strings are old, bridge slightly warped, and is in need of good setup and repair. I know I need to get it to a luthier, but cashflow is putting that off until refund time. Has anybdy experienced this type of thing, and what would cause this problem? Thank you for your input.