sound?

y cant i hear sound/WAV file i can only see the track but i cant hear it there some way to hear it?

click the little speaker icon on the timeline window. See the sound wave icon in the Scene F10 subcontext for audio. Crank up the volume on your speakers until your ears bleed, then back it off a little.

thx papa… but i have 1 more non related question is it possible to animate grass growing in blender? like a timelasped