Hello Forum friends. I have a hammond xk-3c and lower manual xkl-3. I recently moved the double manual to a different location. For some reason the lower manual does not make any sound. The lower manual power light is comes on as it should. I've reset factory default on xk-3c. I've looked into menu and found lower keyboard and it said lower manual mute. I changed it to normal. But it just blinks. Is there something I can do through menu to get lower manual functioning again?