bin using biab for dozens of years. recently purchased mixer to feed biab background rhythm from laptop thru mixer into sound system. All of a sudden music will lose temp, speed up or quit all together in middle of song. very disconcerting when playing along as soloist to audience. Have changed drivers in computer, but problem persists. Often it does not show up until later in the performance, e.g. runs well for an hour then starts to crater. need help urgently. Traditionally mixer used by live musicians to feed sound through amp. Because biab is computer generated music, can there be a conflict coming out computer thru mixer. any help or advise greatly appreciated.