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I am traveling on business, so can not get at the documentation on the CEC software.? From memory I am sure that one of the control shifts the signal on the "roofing" 45 mhz filter to act as a gain control.? The filter skirts of the single crystal would be more gradual than the sharper skirts on the 12/11 mhz SSB filter.? The other is moving the BFO to change where the signal is received relative to the SSB passband.? I just do not remember which one is which without the documentation.??

Since you are moving the center of the signal across the pass band of the filter you should be able to move the signal up against one side or other of the skirt of the SSB filter to narrow the received signal.? My use of the CEC sliders has not been very precise.? To make the software work more efficiently for the operator, I would look at adding another encoder in place of the Nextion slider.? Issue is what I/O do you give up to connect it to.? Another option would be to use a switch to toggle the frequency encoder to do both frequency and IF shift.? Would be better than what I have used on the Nextion screen.? Response there is not always accurate.

Above are just ramblings.? Please take with a grain of salt.

73
Evan
AC9TU