MAuDio
you'll run your PreAmp Outputs to your card using 1qty cable.
One method is to use the "red/white-RCA" inputs on the card.
So you can buy a cable for the PreAmp to the Card.
Suggestion: TRS/1/4" to RCA plug.
TRS/PreAmp and the RCA/2496...
Your PreAmp is Single channel or Mono. You don't need to worry about stereo outs from the Preamp. The PreAmp outs are the same signal.
Your card will have one channel empty now...one RCA jack IN/Left not used.
However?,....
You could also use a cheap rca cable splitter and apply the same signal to both IN/left and IN/right rca on the card... So your PreAmp out would plug top the splitter, then the splitter would plug into the red/white rca plugs on the card.
:::rca female to double rca male (radio shack).
This could be cool as you could for example, lay down a Vocal clean track into one track/Right and then have the 2nd or Left track come in and apply effects...kind of a simulated stereo.