Extra controller via xpadder in Gtr2 doesn't work

[Tomas Reinicke]

I have 4 controllers:
1 SRW-S1 "Button box"
2 G25 Pedals with Bodnar box
3 G25 Wheel
4 TH8-RS shifter

rFactor and Gtr2 only can see 3 controllers so I mapped the gears on the TH8 to the keyboard with xpadder and in rFactor it works, I can also write in notepad with the TH8, 1st gear = T.

But when I start Gtr2 and map a gear to T, and put it into gear nothing happens.

Is there a difference between Gtr2 and rFactor?

How can this be solved?