robbmasters you cant take control of the ableton with your fingers directly using normal and standar touchscreen.
The size of your finger make that not possible and the resolution under cheap touchscreen.
You can buy a wacom expensive magnetic pencil/tablet and with that yu can !! but check the price you have to pay : )
Ableton GUI its not designed for work with touch screen directly, you need some frontend specially designed for that, specially for one thing, size of buttons, sliders, etc etc.
Size its the trouble.
I see some people use tablets, but dont think that its confortable way to play with ableton due you have use pencil.
Best regards.

