At the mometn it is impossible to fade out the audio
if i want to have a different audio per panorama or per group there is no CROSS FADE or FADE IN FADE OUT in the audio
the same problem happens when i play a video, the base sound brutally stops and the video plays it's audio
I think that a FADE OUT option on the audio would help a lot to maintain the experience of each tour very smooth
I agree those would be very desirable features.
PTP audio features utilise the krpano sound interface plugin as far as I know:http://krpano.com/plugins/soundinterface/#top
Ir appears that what you seek should be (technically) possible.