Timpani

You can play the timpani on your smartphone.
You can assign sounds from C1 to C5 to each of the four timpani on the screen according to your preference.
Click the menu button at the top right of the screen to open the setting screen and change the assigned sound.
In the initial state, it is set to E2, A2, D3, G3.
You can mute the ringing sound by clicking the mute button below the timpani.