Everyone,
I posted a few weeks ago about a MIDI synthesizer shield that we currently have on kickstarter.com. To support that board we have created a support library that works in conjunction with the Arduino MIDI library. It can be used with our shield or with other hardware. In particular, it allows a user to 'capture' MIDI note-on/-off messages in time, store them, and then play them back.
A blog post is shown below. It includes some notes on using the new library with different MIDI library versions as well as direct links to download the new library from github.
I hope this is found useful on your MIDI projects!
-Keith