Apparently my son's fairly new bass (Christopher hybrid) has "wolf tones" - a scratchy, funky sound that is especially pronounced on the A string. It sounded fine initially, so this is something that seems to have become more pronounced over the last several weeks. Will some adjustments in the bridge and perhaps tailpiece generally do the trick? Maybe the soundpost too? We'll be bringing it back to our local luthier after the holidays, but just wanted to gather as much info on the topic as possible. Thanks!