async playVoiceOver ({ dispatch }, soundIdPromise) {
      dispatch('audio/fadeTrack', { to: 0, track: 'voiceOver', duration: 100 }, { root: true })
      const soundId = await soundIdPromise
      dispatch('audio/playSound', { preloadedId: soundId, volume: VOICE_OVER_VOLUME }, { root: true })
    }
Plays Voice Over, fading out other voices if they are speaking.