Mass Effect 3 sound issues

[smythn]

I'm not sure if anyone else is having problems with this but, here goes;

I picked up my copy of ME3 earlier and as soon as I started the single player campaign, all speech from any character appears to be muffled and almost non-existent.

Any help on how to solve this fiendish mystery would be greatly appreciated.

 

[smythn]

I'm on the 360, apparently it was caused by my shields, as soon as they were depleted I got my sound back.