I hope some one can shed some light on my quandry. We did a complete set up on my bass the other day. While the bass is laying with the neck on our custom neck support. There is no fretbuzz at all. When you turn the bass on it's side in a playing position the A string buzzes real bad. For the life of me I cant figure this one out. The frets have all been properly leveled, the tuners lubed and tightened. The bridge and saddles are tight and keeping the proper radius. Also the truss is fine and neck relief is set correctly. Any Ideas guys?