Hear yourself...?
Do you mean when you speak from the mixer/control room...?
For that, you need a mic, and you need to feed its output into your headphone mix.
Can you describe in more detail how you have things hooked up and how you are attempting to get your voice into the headphone mix?
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miroslav -
miroslavmusic.com"Just because it happened to you, it doesn't mean it's important."