Dp4 Midi Playback Problems, can't playback midi tracks thru computer Options

[psilocybenine]

I've read everything in the manual about midi playback and patchthru and all its told me is that if i want to hear my midi information at all i HAVE to echo it back to another midi device... problem is i have limited equipment and i need everything to playback through my headphone out on my computer and not the L/R on my Triton. I've read of at least one other person having such a problem but have not come across a solution. Rest assured my MIDI hookups and settings are all set... Reason will sound MIDI info through my headphone out and i'm only using GM banks on the Triton. Whats the deal???