Reply to Question regarding routing to ableton and line in on Kontrol s4

Hey guys, i bought my S4 about 3 weeks ago, absolutely loving it! But i do have some questions regarding the routing of Traktor to ableton. I use Jackosx to do this which seems to be the best solution. (please let me know if you know of any better) I tried soundflower but was getting artefacts every now and then so i stuck with jack. The thing i can't figure out is that when i use either of the two, the line in in my s4 becomes unavailable as it says it's not supported in preferences. Is there any way to route to ableton and have the line in available? or do i have to get a hardware effects unit?