I purchased a sonic port vx on Amazon and when I got it I noticed the left microphone was muffled and not nearly as sharp as the right, I returned it and purchased a brand new one from guitar center, it worked great out of the box the first day when using it the second day I notice the left microphone was now muffled like the first one I bought. Has anyone else had or has heard of this problem. Could the software be blowing the mic or my IPad ?