Method get_bgm

src/script.rs:234–236

(&self, index: usize)

        text: SharedString,
        voice: Option<(SharedString, SharedString)>,
    ) {
        let (chara, voice) = voice.unwrap_or_default();
        self.backlog.push(BackLogItem {
            front: name,
            back: text,
            script: self.name.to_shared_string(),