I wouldn't bother with putting a DI across the speaker outputs unless you're trying to capture the sound of power tubes. As far as I know, the Walkabout has a solid state power section, so the post-EQ DI output should sound the same as if you'd hooked up a DI to the speaker outputs. Also, if you ever try doing that, make sure you have a cab in paralell with the DI to soak up the power, or will fry it.