Mapping help (FX)

Hello, I'm mapping my x1 in MIDI mode to A & B and mapping some effects to "shoot" when I press the button, but I'm with some issue in one.
The map is:

BUTTON 3 ON FX 2 (CH1 CC15) (ASSIGMENT FX UNIT 2)
FX UNIT SELECTOR MODE: BUTTON - SINGLE - MODIFIER: [FX UNIT2 - GROUP]
EFFECT 1 SELECTOR: BUTTON - DIRECT - TAPE DELAY
DRY/WET: BUTTON - DIRECT VALUE 0.5
KNOB1 (FX UNIT): BUTTON - DIRECT VALUE 0.81
KNOB2 (FX UNIT): BUTTON - DIRECT VALUE 0.96
KNOB3 (FX UNIT): BUTTON - DIRECT VALUE 0.80
BUTTON 1 (FX UNIT): 0
BUTTON 2 (FX UNIT): 0
BUTTON 3 (FX UNIT): 0
UNIT ON: ON (FX2) (CH1 CC09) (I use to "shot" the effect)

Well, I'm not advanced with mappping but this "almost" work, whats happen is in the 1st time I press to shot the effect don't sounds like the parameters is set. Sure it's selected the parameters like I set but not work, when I press again the effect work like I want.
Any help?

thanks
ps: sorry by bad english