I won’t make any arguments about Iambic A vs. Iambic B. But, please see page 30 or page 37 of the KX-3 manual. Iambic A is the default, but the CW IAMB menu item lets you change it to B. 73 Ray K2HYD KX-3 # 6827 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus