The size of your soundboard effects three things in your call, the rasp, the tone, and the volume of a call. If you have a 3.5 surface and your using a 3" soundboard. If you go to a smaller size soundboard, you will increase the volume and raise the tone of it, the rasp will decrease, because your soundboard has more support and will vibrate less and give you a higher pitched, smooth sounding call with less break over. If you wanted more rasp and a lower tone in your call, don't shrink the size of your soundboard, make the size of your pedestal diameter smaller, and maybe thinner. If you thin the thickness of your pedestal, thin it from the inside out.
