im interested in one of these little devices but i have a question for example if im recording some music and i need to switch an effect how can i do it? do i need to stop recording and change the effect manualy in the computer or there is some kind of footswitch for this?
That is a really good question that I would like to know the answer myself as I own one.

I can't see any functional way to do it. Maybe try searching/asking on the Line 6 forums on their web site. They have a forum dedicated to Pod Studio/Pod Farm (Toneports)