Guitar input level low with lexicon alpha

I just started with garage band today. I am using a lexicon alpha usb interface and seems to be working fine, or at least I think it is.
When I am playing my electric guitar through the lexicon garageband picks it up well as long as I use one of the preset amplifier/pedal combos that are provided. When I try to directly input the guitar using "real instrument" the line level seems really low. I have to max out the volume pot on the guitar to get a low level signal in garageband. Clipping will never be an issue as is.
I know that with my microphones I need to have a seperate phantom power supply. Bought it. With my electric guitar, I am sort of a tone freak and like to mess with the volume pot to clean up the sound. I cannot do that as is. Everything is wide open to get the signal into garageband. Am I supposed to be using a power supply to boost the guitar signal into the lexicon?
Thanks in advance. Love the potential, I just have to work through details.
Matt

pensncrows wrote:
Thanks guys. To answer a few of your points:
I am using a Fender Strat with Big Dipper pickups.
The line 1/Inst pot is turned all the way up.
The phantom power thing was sort of worded poorly. I know it would not work for a guitar but I meant that perhaps I needed to boost my original guitar signal somehow so it would pick up louder.
I guess I could just mic my amp. It doesn't seem like I should have to though.
The rockman...I looked it up and it looks like a headphone practice tool. Is it for usb connections to garageband?
No, it's a guitar preamp, analog out from the headphone jack to your interface of choice, just go to a guitar store and try one.

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How to Reset NVRAM on your Mac - Apple Support
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