No midi playback - M-Powered ProTools, EWI 4000s, Mobile Pre

[msgood]

I'm using Pro Tools M-Powered 7 on a Dell laptop. My audio interface is a Mobile Pre, and my midi interface is a Midisport UNO (USB). My midi controller is an Akai EWI 4000s wind synth. I can lay down a midi track just fine, but when I try to play it back through my monitor phones (which are plugged into my EWI), I can't hear anything. I've tried plugging the phones into the Mobile Pre, but still no sound.

One thing I noticed is that, when I started my session I set my Midi In and Midi Out to the UNO's drivers. But somewhere along the way those settings reverted to ALL (midi in) and MicrsoftMidi Map (midi out).

Help appreciated.