Reply to tempo fader confusion

question.. i am a long time user of the vci-100 arcade mod and i mapped my tempo faders to have a soft takeover. They word well like that. How the hell am i supposed to use the sync option on the s4 then adjust the tempo after mixing over without the tempo jumping since the fader is out of place? i tried to re-map it i couldn't get it. May seem hard to understand, hopefully someone gets what i'm saying.