Need a little help...

I am trying to use the Spectrograph function.
Visual FX DMX = 123.

I only use Catalyst once a year.
It's on a Power Mac G5.
It has Catalyst PM V4.1 m119

I have two choices for plugging audio in.
First is the built in mono Audio In on the back of the box.
The manual says it's for a "microphone or other self powered devices."
Second is an audio/video card that is installed (AlchemyTV).

The only way I can get it to work is by plugging into the built in Audio In.
But then I only get one channel (it looks like).

If I use the Alchemy input I can see audio in the G5 system's Sound control screen, but the Catalyst won't let me select it on the Control Panel. It lists it but when I select it from the drop down, it just stays in the Line In.

I have the Parameter 1 (FX1) set for 0 and I get a waveform that appears to only be on the left half of the screen. Am I missing a channel or is that it?

What's up?