Im running an all software set up on my pc right now, but i plan to add a mic preamp, and a couple of hardware synths down the road. Can this outboard equipment be daisy chained to my souncard via stereo analouge inputs, or am i going to need some sort of audio interface ?

my soundcard is a Terratec EWX 24/96 with 1 set of analouge stereo ins and outs and a digital in and out and a joystick type midi connector

thanks!