Hi. I'm playing distorted electric guitar chord fragments in a worship band. I'm playing through a Korg AX5G and I find it very difficult to hear my playing through the monitor when the whole band is playing. Is it possible to connect a computer speaker to the DI box so I can have an extra monitor beside me?
Unless your computer has unusually high-powered speakers, they are not what I would recommend to use as an additional monitor. Yes, you can plug into the other input/output of the DI and connect that to your speaker, but if you are having trouble with a "real" monitor, this is not likely to be the best solution (too weak, fiddly to plug in, turns righteous distortion into angry mosquitoes).
If you have a regular guitar amp, this is what I would recommend as your alternative monitor - it is built to play guitar through, and should sound at least OK. That way you have complete control over your sound levels. Of course the rest of your worship team may not be too keen on you blasting them with a Marshall stack, but as long as you are considerate, it is a good option. You just use a guitar lead to plug the other output of the DI into the amp input and you're good to go.
If you have no amp, then you need to make friends with the sound guy and get him to turn you up in the monitors. Bear in mind that you may be sharing a monitor send with someone else in the team, so there may be limits to how much of you they are willing to inflict on your monitor-buddies. Still, you can ask.
