No, I am not an ESSB guy. But, I do like my tx audio set to 200 low, and 3000 hi. I cannot find TX ESSB under the Config menu. I'm "assuming" that the 6 and/or 2.8 KHz filter(s) need to be installed first? Based on what I'm seeing under the standard Menu TX EC, I can achieve my desired ranges by setting/playing with that. 73 John K4NP