Over the years, with the exception of basswood and mahogany I have used all of the woods listed. All have worked well. Type of wood used and thickness influences tone. I have my best luck using a different type of wood for the paddle than I use for the box itself. From my experience, the larger the call, the louder it is. Finishing can help seal the call, but must not be used on the lip of the call or the bottom of the paddle as this will reduce the friction needed to make sound. It can also change the tone of the call as it makes the wood used more dense. I like to experiment, and for every good call I make, I throw half a dozen away. Most of the good ones I make, I end up giving to friends. I once made one about 18 inches long as a joke, but it ended up making great sound and it's loudness makes it a great locator call....... it's too darn big to carry in the field, but is a prized possession of a friend that locates birds by walking out the back door of his house.