I won't explain all the details of how to create a custom DSP using kX. Other users have already covered that subject so if you don't know how to do it, you can read up at these sites:

A newbie guide on kX's concept or "How to setup your own DSP" - for musicians
(by Lex Nahumury)

kX Getting Started Guide - Basic DSP Routings
(by dj_stick)

     You will need to download a plugin to make this whole DSP thing much simpler. ProFX for 3534f or 3544a . Read the whole page before you download so you know a bit about the whole subject.

     Click on the appropriate link on that page
ProFx v3.08 for all 3538 kX driver versions! (for 3544a)
ProFx v3.08 for 3534 to 3537 kX driver versions! (for 3534f)

     Alright, now you know how to add some plugins. Now we need to create 2 basic DSPs. One is for your CLIENT card and the other is for your HOST card.

     Keep in mind that you don't have to have 2 kX compatible cards to tie them together with a DSP cable. If you have a different brand of card with an SPDIF output or input, in many cases, the connection will work.

     The CLIENT card DSP setup is pretty simple for the 2 card setup. We are just sending the analog inputs from the CLIENT card over to the HOST card via SPDIF outs and ins. Refer to the kX Client DSP for 3534f.
Currently ProFX for 3544a is not working 100% so a couple of modifications have to be made if you are using XP / Vista and 3544a with ProFX kX Client DSP for 3544a.
     The Line in of the Client card is routed to the Rear out of the k2lt plugin. Refer back to the SPDIF diagram and you will see there is a bluish / purplish SPDIF cable going from pins 27, 28 (Digital Rear) of the Client Card. This corresponds to the Line in routed to the Rear out of the DSP. The other connector of that SPDIF card goes into an SPDIF in the Host Card at pins 5, 6 (Z Video I2S In). See the kX Host DSP for 3534f      Or      kX Host DSP for 3544a.

     The Green cable shown in the SPDIF diagram can be traced in a similar way. The orange cable, as I said before is not being used for anything at the moment. It is just there to demonstrate another SPDIF connection from the Client Card to the Host Card.
     The Aux Inputs shown in the ADC plugins of both the Host and Client cards are utilizing a second converter to enable an extra stereo analog input in both cards. That connection is explained in another webpage: Build a second analog input for your Audigy

     The last page is a bunch of pinouts for different Creative Labs cards, click on the "F" link below.

A - kX Project-Short Introduction

B - kX Project-Uninstall the Creative Labs drivers-Windows 98SE

C - kX Project-Install the kX drivers

D - kX Project-Install a second card

E - kX Project-Create a custom DSP

F - kX Project-Pinouts of kX compatible cards