Due to unfortunate 'gremlin' activity an error crept into the latest Control List. The section on XP stations should read: IB XPL Low Tones not yet accurately measured. M12 family XP 303, 319, 335, 351, 367, 383, 399, 415, 431, 447, 463, 479, 495, 531Hz M78 Apologies for the error. 73 Paul