Bug fixes in fadein/resume -- don't bump up volume while crossfade is active!

Signed-off-by: tory <tory@lacasabonita.com>
Fixed still more fade/crossfade bugs -- set nextAudioObj volume to 0 before attempting to begin fade. Still one more bug to work out in volume reduction (rapid reduction can lead to volume going down one more apparent unit on next loop)

Signed-off-by: tory <tory@lacasabonita.com>