I talk often to a very hard of hearing friend and I have to practically shout in order for her to hear me when I'm wearing my earbuds. I wear them because she talks a long time and I can work around the house while chatting. By the time we get through I'm practically hoarse from having to talk so loud. Is there an iphone app that will boost my voice or is there a better set of headphones that I can use with a better mic?