While playing a gig outside on a terrace my sound just wasn't right, there was a strange extra component that I couldn't shake. Tried changing mouthpieces and reeds to find something that worked right in the environment. It wouldn't go away, then realized that about 10 feet directly above my chair was a celing fan moving at a pretty good rate. There were many fans in the area, but I only switched off the one directly above. Made all the difference. I could not detect that the fan affected the bass or guitar. I don't know if someone some distance away could also hear the distortion when the fan was on or if it only affected me, being directly under it.