Spoilers in here!!
Just in case you read forums before playing a game
Anyway. Jack figures out Fontaine is controlling him with key phrases right?
So why not just stamp on the blasted radio? Or just cover his ears and go "lalalalalala!!"
A big set of ear muffs would do the trick.
On another totally different note. Why with chamo skin can you change a huge gas canister on the chemical launcher without being spotted but when you press a tiny button on a camera you get seen instantly.