Here is a link for what you may be looking for.  It appears to enable
a MIDI output:  http://www.ikmultimedia.com/Main.html?MainPage.php 

Phil Dayson

 [ At http://big-geek.com/?p=348  "The iRig MIDI is a compact Standard
 [ Core MIDI interface for iOS that IK says will allow you to connect
 [ any MIDI-compatible device to the iPhone, iPad or iPod Touch."
 [ -- Robbie