Sounds not working for buttons

hi, this time its easy to explain ^-^

i have a movie clip with two frames (its for a simple button).
the movieclip is “acting like a button” (i chose the option)
in the mc, on the second frame, on a new layer i have a soundfx. when i play there and then, i can here it, but everytime i test move, it doesnt play.

can anyone help ^-^

thanks