you don't need to switch tuners, the machine does that for you, if you are watching a satellite channel and want to watch a cable channel, just go to that channel
If you mean you have different softcams running the lines, then you'll have to swap the softcam in softcam panel.
It would be easier to have the sat and cable lines in an oscam.server file and use oscam softcam as that will open sat and cable lines