yes you have to dial it in. when i bought it i did what i normally do throw away the directions and i tried it at dans house, we could not get a wave to start in it we tried for about 20 min. then dan told me we have to adjust it, but we never tried it again i figured the box was not big enoughf for that size tank, but then i hooked it up in my tank and i had to unplug it becasue it was about to go over my overflow :wacko

it is the first time i have seen one in person