Akai EIE Pro - Roland SP 404 not working in inserts

Hello everyone. I'm using akai eie pro as my soundcard and i just got a Roland SP 404 sampler. When i plug the sampler in the audio inserts on the back of Akai Eie Pro i have no sound at all. When i plug it directly to my speakers it works well. What might be the problem ? Thanx
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