Personally I think the Gemini iKey is wasting ur money, especially if you have a laptop!
I find it unecessary in your situation, unless you didn't want to carry your laptop AND tunes to a club.....hard enough keeping track of tunes when your pissed haha let alone a laptop!
All you basically need to do go from either RCA or 1/4" out of your mixer to RCA or 1/4" in your computers soundcard.
Doesn't matter what it comes out of really, my mixer only has a master out (two of.)
Aslong as ur not clipping.
If you had a desktop, I'd recommend an M-Audio Audiophile.
They are cheap and are a bloody good build.
You'll find a lot of people writing beats (signed) are using them.
For a laptop...A quick look around on this forum,
I'm sure you will easily find some reviews on the best External Card for you.
External cards are usually 4 channels(2 x Left, 2 x Right) In and 4 channels Out, you wont need anymore.
And 2 channels In (L +R) and 2 Out is fine for what you need anyway.
If you really did want more, just buy a small mixing desk.
This would save you having to unplug things when recording from other devices (synths, drum machines, whatever)
Obviously you couldn' record more than one at a time but yea.
It's not needed in this case(so you might aswell ignore that paragraph, you don't need to buy another mixer).
I've bought from (and recommend) using this person on Ebay.
http://search.ebay.com.au/_W0QQsassZaudiosyncrazy
They are the cheapest I've found, have SOLID feedback and even with postage from the USA.
I still saved a bucketload of cash on my card, Everyone I know pretty much buys everything Audio from the States.
Except monitors, price, postage & tryna service/repair the stnuc would be long.
The obvious alternative is to use the internal soundcard on your laptop which should have a line-in (usually?).
Go from RCA(or 1/4") to your basic headphone sized plug into your PC.
The only problem is, it will sound like shit more often than not.
Software wise.
If your using a PC - Soundforge or Cool Edit is what you want to record in.
It's far simpler and easier for you to trouble shoot than routing shit within your sequencer.
(Tryna keep it simple
. )
If your using a Mac, Peak is the best wave editing software in my opinion.
The iKey would be ideal for recording sets out, but personally for the price, Id get iRiver
It would be cheaper (unless the iKey dropped in price since I looked at it.).
Surely it would be far easier to look at a screen on your laptop for your levels and not the ikey with LEDs on the box?
I know thats a fuckload of typing, but it hopefully covers any bits you were confused with.
Kept adding and adding haha
Sorry If I've completely missed the point, not trying to make you look or feel thick, just trying to help.
Soundcard would be useful for future production plans also