How to record your voice and sounds that are INSIDE your computer?

So I'm using screencast-o-matic and I record Minecraft videos. I'm wondering how do I record my voice and in game sounds at the same time using screencast-o-matic. If the software itself is not letting me do it or I just have it set to a wrong microphone setting then either tell me a better software (besides fraps…) and/or tell me what microphone setting I should set it to.

Ghoul

Try this:

http://www.ezvid.com

Guest

Ghoul, camtasia is the best one for recording computer screen in the market but it is expensive. Try also Jing.
I use Jing a lot.

Guest