Program what you want to program. Mine is PD/FD on that knob. And there is a hold button too.If you have a system programmed then, it would be constantly scanning? If you have Albany PD that has 10 different talk groups (as example), you wouldn’t only be able activate one TG on that knob, as you would with Hold on the SDS100? Or, are you able to program certain talkgroups?