I am a high school band director and I have been using MultiTrack with our new sound system. I recorded this today using an SM58 running through a Mackie ProFX 16 board. I use a Tascam iU2 to interface with the iPhone. I ran the metronome through a pair of AKG K204's and I did get some bleed through of the click into the mix. I need to experiment with levels and mic distance. I really love the app and I am going to a lot more of these recordings to give as gifts this holiday. My back ground is not in recording, so I would love feedback on how to make this recording better. (I will worry about the flute playing.) http://youtu.be/4D-4cp132uI