Audio input and output

I am trying to get audio to play through from the audio input to the audio output. I have plugged a line-level keyboard into the audio input and as I play it, it shows that it has plenty of input level in the sound panel of the system preferences. However, there is no sound coming out. I have tried speakers, headphones and the Griffin IMic. If I use a program like SoundStudio3 and click the audio "thru" button it works fine, but it does not work without.
Is there a THRU switch that I am missing somewhere? I tried the Applications/Utilities/AudioMIDI setup to configure it, but the Thru button at the bottom is greyed out (not in operation).
Thanks.
2 GHZ intel core duo   Mac OS X (10.4.8)  

Hi Rich,
Welcome to apple forum.
In my opinion, I don't think OS X have the capability to sent the audio input "THRU" to output directly (I could be wrong).
You need to use Garage band or third party software like you mention before to allow it.
Maybe if you connect third party device that is "supported" the signal become audible and you can hear it. Like mBox using core audio driver.
http://www.apple.com/macosx/features/coreaudio/
Good Luck.

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