thank you actually it seems quite obvious, why didn't I think of it, but thanks...
but what if I want to use the 0 - 10 volts as an output...
it only sends out 0 - 5 volts...
is there some kind of transistor that when the base opens in the range of 0 - 5V, the transistor slowly opens, and sends out (from collector to emitter) a range of 0 - 10Volts... or is there another way??