Hey folks, a few years ago I learned about an experimental dulcimer called an 'Aquavina' which uses a metal bowl filled partially with water as a resonator.

Without actually hearing any, I devised a dulcimer that I hoped would achieve a similar effect by using a bundt pan built into a wooden body dulcimer. Over time I've built 5 similar dulcimers. This video is a demonstration of how water changes the tone of three different dulcimers
The first is plywood with a moderately thin pan Tuned DAd with a 26.5" VSL
The second is particle board covered in acrylic paint with a thicker pan tuned EBe 23" VSL
The third is birch plywood with a very thin pan tuned Fcf 23.5" VSL