I'm afraid this is no error. The timing routine in SRM has no sound when timing a race or practise session. To reach real 1/1000 second accuracy during timing, SRM speeds up the PC timer. Unfortunately, this prevents sound being used during timing, because the waveforum of every sound is created using the PC timer. When playing a sound, the timer is reset back to it's original speed by the controlling hardware and the timing software freezes. Up until now I haven't found a way around this problem and I doubt there is any.