Sorry any confusion you may have encountered: the MIDI Memo Recorder app was updated to version 2.0.1 in January of 2011.  In that update we removed (because it was quite cumbersome) the original wifi-based method for transferring MIDI files from the iPod touch, iPhone, or iPad to your computer and replaced it with the Export (via iTunes File Sharing) function.  The Advanced Guide on the Line 6 website describes MIDI Memo Recorder version 1, not the current version 2.

Q: How does the Export to iTunes option work?

A: After using the "Export" option in MIDI Memo Recorder version 2.0.0 or greater, sync your Apple mobile device to the iTunes app on your computer. Then in iTunes, find your Apple mobile device in the "DEVICES" section on the left side of the screen and click on it.  When the Summary page for your device appears, click on the "Apps" tab and scroll down to the "File Sharing" section.  There, find and click on "MIDI Memo" in the list of Apps on the left, and all files exported from MIDI Memo Recorder will appear in the "MIDI Memo Documents" list on the right.  To save an exported file to any location on your computer, first select the file in the list, then click the "Save to…" button below the list, and navigate to the folder where you want to save the file.