Have you had a look at the card's options. In the bottom right hand corner of your screen should be an "M" icon which takes you to all the options for the card. Make sure you are running out the right audio path and that you haven't got something muted.

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That would be because the delta 44 (like 95% of most prosumer/professional sound cards) has balanced mono inputs and outputs. If you want stereo in, you'll need to get a stereo -> 2x mono 1/4" adapter.