Hi Irad, Your explanation is helpful, especially for operations where people are not on the primary / preset frequency for a given band. But that is not what I am encountering. I park on 14.105, and nearly always select it from the band drop-down. I then click on the slot mover. By using the keyboard left and right keys to move around the slots. But what I can accidentally create is by doing this, the slot area goes empty, meaning VarAC believes it is on center slot. But the frequency is not 14.105 anymore. It could +/- one slot or more. And by using the keys, sometimes I get back to the slot being clear and theVFOis 14.105. Other times the only way to sort it is by choosing the frequency from the drop-down again. It's not so broken that it happens readily. But by going up and down the slots with the keyboard, it eventually gets out of sync. I was able to reproduce it as I was going through the steps to write this up. And I am attaching a screenshot of the error. Keep in mind I never touched the VFO, only left and right arrow keys. Now here is an important piece to the puzzle. Today there is a strong solar storm and the bands are quieter than usual. When the band is quiet, the problem was difficult if not nearly impossible to reproduce. But when there was traffic and things were being decoded, beacons updated, CQ windows updated, then the error seemed easier to trigger. And this is not an underpowered PC, AMD Ryzen 5700 CPU with 16GB RAM. I hope that helps explain this. Once the bands go back to normal busy traffic, I can probably grab some logs. 73 Doug / N3JXB

I think this feature would be very useful. I was thinking along the lines of the old BBS, but with a modern interface and speed. I'm glad to see someone else has requested it.

I'm aware of the CAT strings to invoke the different passbands. If you look at the data I submitted, you will see the string for ModeUSB_D is exactly the code for DATA 1 Filter 2. Here are the lines I copied from the VarAC_cat_commands.ini file. [Icom IC-7800] # <<<--- My rig, not the IC-7700 CmdType=HEX PTTOn=FEFE6AE01C0001FD PTTOff=FEFE6AE01C0000FD ModeUSB=FEFE74E00601FD #ModeUSB_D=FEFE74E00608FD <<<--- NOT USED ModeUSB_D=FEFE6AE02600010102FD #For different USB-D filters and DATA1/2, Replace ModeUSB_D value with: #DATA1-Filter1: FEFE74E02600010101FD #DATA1-Filter2: FEFE74E02600010102FD #DATA1-Filter3: FEFE74E02600010103FD #DATA2-Filter1: FEFE74E02600010201FD #DATA2-Filter2: FEFE74E02600010202FD #DATA2-Filter3: FEFE74E02600010203FD ModeFM=FEFE6AE00605FD SetFreq_Data_method=BCD SetFreqVfoA_Cmd=FEFE6AE005{}FD SetFreqVfoA_param_length=10 SetFreqVfoA_hz_res=1 ReadFreqVfoA_Cmd=FEFE6AE003FD ReadFreqVfoA_Result_Data_method=BCD ReadFreqVfoA_Result_hz_res=1 ReadFreqVfoA_Result_Length=22 ReadFreqVfoA_Result_Freq_Start_Pos=11 ReadFreqVfoA_Result_Freq_Length=10 VarACStartCmd= VarACExitCmd= The CAT command does indeed work properly but ONLY after I change band or slot. Initially it seems to be only grabbing the frequency but does not set the filter.