Hello dear friends. I have three solutions to propose (I understand it's an old thread, but I 've just seen it
).
1. There 's a handy app, named "Disable Increasing Ring". Working like a charm!
2. You can arrange your mp3's (let's say on "Soundtrack Pro" or Garage Band or the likes) so that they have a 1 to 2 sec silence in the beginning. I myself prefer this one, which is absolutely fine and charming!
3. You can have your device rooted and then adjust the thing.
Hope I helped!
Have it nice and smooth!
PS. For the dear Motorolla users, try the 4.4 KitKat. There's a say that the problem is fixed on this babe.
For those hesitating rooting the phone: DO dare it! It's really handy! AND YOU CAN EASILY HAVE IT UNROOTED! Just be informed in the related forums (XDA and the like).