Hmm dunno about 5
as for 6 - Are you referring to the sounds directly or are you using channels.
Bear in mind if you change a Channel's volume, the next sound placed in that channel will maintain that same volume, I believe. Plus after 'so many' channels, they will be re-used, so a particular sound may overwrite into a channel already used.
Not 100%, more of a guess as to what's happening....
as for 6 - Are you referring to the sounds directly or are you using channels.
Bear in mind if you change a Channel's volume, the next sound placed in that channel will maintain that same volume, I believe. Plus after 'so many' channels, they will be re-used, so a particular sound may overwrite into a channel already used.
Not 100%, more of a guess as to what's happening....