Reply to Traktor 1.27 + hercules RMX + Source buttons

Hi,

I'm desperatly trying to use the 2 external line-in interfaces ... the source buttons on the hercules rmx. Software: Traktor 1.27
If I try to create a new MIDI Maping for the source Button, I can't find the Element for external input (like e.g. filterHighkill for the kill switch).
Does anyone know a solution? Or do I have to use an other software?

The most important thing for me is to connect two devices to line-in 1-2 and line-in 3-4: a tenori-on and an iPad. Do you know, wich software is the best (and easiest) to do this?

Thanks,
copyriddler