[Zhao Yitian]

Dear Marc,
The Xkey Air is sending the polyphonic after touch by default, but if you want to listen it’s effect, it depends on the sound of received software. For example in Garageband the organ sound (and some synth leads) is responding the aftertouch, but the piano sound did not.
For LogicX, you can record the polyphonic aftertouch message into the sequence, but if you want to listen the effect, you also need to select correct sound which was set to aftertouch responding in the software.