I've started video recording some of my performances at home for posting on Facebook, Twitter, and various forums. I'm using an ipad. I'm quite happy with video quality, but the audio quality using the ipad mic is only just about OK and could be improved. What I'd like to do is feed a couple of my studio mics into a mixer, and feed the output to the ipad so that it replaces the internal mic with the mixer output whilst I am recording video. I know this is supposed to be possible based on Youtube totorials, and I have tried the mixer output jack into a trs adapter, and the trs adapter into a trrs adapter and then into the ipad headphone socket. However it doesn't mute the ipad internal mic. Have any of you folks had any success using the ipad in this way? Any advice?