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:
https://tourmkr.com/F15Lo5xDAM/11957542p&155.53h&87.6t

13d9df45-8d3b-4a08-8473-5ca80e36187b-image.png

But in this case they've added the audio Sound Cloud and then used the embed hotspot with always ON option