Thanks for the quick reply! It's good to know that I can unlock each sound using the switch.
Regarding point 1, I wonder if the radio sound is the same as the sound play function of RPG Maker?
I mean, I can use script: AudioManager._currentBgm.name === "Battle1" to check if the Battle1 sound is playing in the game or not.
So, I wonder if this script works with this plugin to determine what sound this plugin is playing?