I'm probably being a bit dim here, but what does the audio tell you that simply looking at the picture doesn't? It's easy enough to differentiate between gas giant/metal rich/rock/valuable (i.e. earth-like or water) from the picture itself. The subtleties of the atmosphere don't make that much of a difference to its value, surely? Certainly not enough for a tone deaf idiot like me to spend time with each planet selected listening for nuances in the sound.
Maybe I've been out in the void looking at these things for too long - nearly three days now
I'll go even madder if I have to start listening to them too.
(I know there are far more dedicated explorers in the group. They've all been out there for months and I start getting fed up with it after a few hours...)