I’m confused

Trigger Finger Pro + AirDrums (in Arsenal): NOTE ON/ONE SHOT does not work

I load a waveform to a pad, lets say A1,
then under PAD FX, I choose PLAY MODE-> Note On
when I press A1 I will hear all the waveform to the end, going back to One Shot and Note On again, does not work.
How can I make note on to work?
I saw that in some preloaded airdrums drum loops and sounds I works just fine, when I stop pressing the pad it stops playing. Then I noticed that the play mode is set to one shot! What is really happening?
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