If you really want the most resonant wood free of resins etc., just soak it for a year in a river, give it a mild alkaline rinse, let it dry, mill it and let it dry for another 2+ years.

In effect this is the kind of wood in which Stradavari used, somewhat by accident in that the timber was floated down the river, got soaked, was rinsed dryed and milled to dry for several years.

The pores of the wood are left virtually hollow and free of chitin and resin which makes for a superior acoustic conductor. To further convey the idea, perhaps you have noticed how certain kinds of packing foam conducts sound extremely well and that non porous forms of rubber do the opposite.