Keyboard line out and griffin imic incompatibility?

I'm getting horrible background noise when I try to record my keyboard (Yamaha PSR-225GM ) headphone line out through my Griffin iMic into Garageband. I assume it's a level issue but even the keyboard volume control won't fix the problem nor will system settings for the input device. My Sony stereo mic into the same iMic input sounds fine. Headphones attached to the keyboard line out sound fine too so I don't believe it's a quality problem with the line out. Can one not use a headphone output into the Griffin iMic?
If not, anyone got suggestions for higher quality audio input into the iMic flat panel (e.g. some USB box) that's compatible with various audio equipment (mics, keyboards, guitar amps, 1/4" and 1/8" and RCA plugs etc.)? The iMic has served me fine, but maybe it's time to start looking for something higher quality, and more versatile. Thanks.
By the way, anyone know why sometimes there's a delay (half second or so) between audio in and the monitors in Garageband, and sometimes not? It makes performance nearly impossible when there's such a big delay.
SJG
iMac flatpanel 15 Mac OS X (10.3.9)
iMac flatpanel 15 Mac OS X (10.3.9)
iMac flatpanel 15 Mac OS X (10.3.9)
iMac flatpanel 15 Mac OS X (10.3.9)
iMac flatpanel 15 Mac OS X (10.3.9)

tell me if I'm on the right track on the
following theories (I don't know if the following are TRUE):
I'll do the best I can...
1) The quater-inch headphone output from the Yamaha
keyboard is neither "balanced"
Correct, the headphone-out is not balanced. A balanced output uses 3 wires, a graound, a hot, and another hot that's 180° out of phase with the first. This is a neat trick in that two signals 180° out of phase with each other cancel each other out sp you get zero signal. In the case of a balanced out if noise is introduced, it is in phase on both cables. On the other end when the signal on the out of phase wire has its phase flipped, your original signal is now in phase on both legs, and the noise is 180° out of phase with itself, and thus is canceled out.
nor impedance matched
to the Griffin iMic.
The impedance is not a problem here. As I understand it, the headphone-out is High Impedance, and so is the iMic's In.
(I'm using a 1/4" to 2.5 mm
converter cable). I am possibly getting radio
interference (I DID get a local radio station when I
touched the plug right!!) and degrading the signal
because of these two issues.
Possible. A Low quality cable and or adaptor could offer an entry point for noise.
2) It may be necessary to put the signal from my
keyboard's headphone jack into a DI (direct box) to
get impedance matched to mixer levels - the levels I
assume the Griffin iMic expects.
No, this shouldn't be true. A headphone-out is actually much hotter than a Line-In, so the level should be able to offer more than enough signal, and the impedance is matched.
3) I'm HOPING that a high quality audio-to-USB (or
firewire) input box can perform the job of the direct
box.
It could, but the weak point I see is that you're stuck using a headphone-out instead of a Line-Out. I don't think a DI box is going to help any in comparison.
Hmmm, I just glanced at your computer list. Doesn't the iMac have a Line-In jack? Have you tried skipping the iMic and going straight into the iMac?
Finally, if anyone can give me the list of equipment
in order from a keyboard to Garageband
I think it could be Keyboard -> Mac
Other combinations would just be sticking an interface between the two (Keyboard->interface->Mac)

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Keyboard line out and griffin imic incompatibility?

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