bluetooth gamepad button assignments

Hi there. I recently bought two bluetooth nunchuck-like controllers. You hold it in one hand and it has a swivel X-Y axis thingy for your thumb. https://www.aliexpress.com/item/For-Wireless-Bluetooth-Gamepad-VR-BOX-Remot… As a test I paired them with my laptop. I discovered that buttons C and D change the volume and somehow Amarok interprets some button presses as next track, although that doesn't work consistently. I started looking for programs to do the button mapping but I couldn't find one that worked with this controller. My question is, where are these mappings stored in Trinity? Regards, Philip Ashmore