With strange I mean that if I press a pad on the push with normal or hard velocity i get like two tones rapidly after each other daa-daa like. If i press really gently i get the tone only once, as i can hear it anyway.
Turning off velocity to vol in sound settings wont help.
Using a normal usb midi keyboard with poly aftertouch (CME xkey) seem to work just fine without any jerky issues.