While using overlays, is there an option to add background music or voice over or any audio clips.
We do support background audio, and you can add it via the Control Bar
https://docs.gothru.co/how-to-add-an-background-audio-that-auto-plays/
Also we support audio via our hotspots.
https://docs.gothru.co/how-to-add-audio-to-the-hotspot-popup-content/
What you could do is have the audio hotspot always ON, for individual panoramas, like in this tour:
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But in this case they’ve added the audio Sound Cloud and then used the embed hotspot with always ON option