Why does mbox2 rec. my playback?!?!?

[Steenamaroo]

Generally, people use their interface for all audio output.
To do that your speakers (amp if applicable) would plug into the mbox outputs.

In Utilities->Audio/Midi Setup you'd pick the mbox.
That means everything comes out of your speakers + headphones....protools, itunes, youtube etc.

I'm pretty sure the mbox headphone output is a mirror output, meaning it doesn't mute the speakers.
You should have a separate volume knob for each, unless your mbox is a mini.

If this is what you're trying to achieve, nothing should playback 'though the computer'. (by that I mean built-in audio)

Yea i updated to 10 and like i only get to hear it threw my headphones only not threw the output of the computer i would like to hear it threw both

You really need to be much more descriptive, but the simplest solution is to forget the ins and outs on the computer; Your mbox replaced them.