Input signal, no sound

[jasdell]

Windows XP SP2|Pro Tools 7.3.1c7|MBox2|Fantom S-88. I patched my Roland through to PT and within an Inst. track, the tiny input meter says it's gathering midi data but there's no sound. If I just do it through a midi track, the bar is gathering midi (jumping) and even records to PT, but upon playback---nothing---no sound. I can hear the midi through my synth (Fantom) if I plug my headphone into it, but the sound is getting lost in translation to my Mbox2 (so I can't hear it through headphones connected to that).