Tip: if you don't like the sound change the striker first!
Fred
Couldn’t agree more with Fred. The striker can make or break the call.
Here’s a few combinations I’ve found to work well. I threw in a few wood species not listed.
Cherry slate over aluminum
Walnut slate over glass (slate over aluminum for a little more rasp)
Zebrawood aluminum over glass
Padauk crystal over slate
Yellowheart slate over glass
Mahogany glass over glass
Birdseye maple crystal over slate (yes I specified Birdseye because from my experience Birdseye maple makes a way better sounding call than any other maple... I have no clue why)
Cherry seems to make a good call in almost any combination
The darker Cherry heartwood seems to make a better pot and striker
Josh