one piezo for the head and an other one into the shell for the rim…  you have to setup your module : input type = piezo/piezo

check your user manual ( you can choose between piezo/piezo  piezo/switch  switch/piezo  switch/switch)
so you can configure all your pad like that… to have to sound by pad…   (not sure because i don’t have this module… but sometimes want to have two of them with a midi merger…20 inputs )