Hi insideplaces, as per my comments here: SoundInterface doesn't work on iPhone. Why? there's no sound for your tour on my iPhone 7 Plus. I connect a bluetooth headphone and there's the coolest music!
Hello Guys. Thank you both for your answers. It turned out be a cache issue. Just cleared the browser cache and cookies and the sound started to work.
A friend of mine also reported this, and it was his iPhone silent mode switch.