Right, Ladik has excellent value for the money. Rather than investing in a specialized interface module (ALM S.B.G for example) you could get away with getting a pre-amp (A-510, A-520 , A-525 ) for input from computer to modular and a mixer (M-110, M-120, A-530) for attenuating from modular to computer level. BTW, no affiliation with Ladik here, I'm just a satisfied user. There are many alternatives. Note that this will be useful for most any external input, hi-fi, walkman, phone, whatever. And you will need a set of matching cables.
By know you are suspecting that just making Clouds work costs as much as the module itself. And oc you're right. On the other hand nothing of that is lost once you decide to expand ;-)