I'll be back later. I have to run. Main problem with that soundcard is that the outputs are stereo. Your speaker (Behringer B215D has mono inputs) So you need to get an adapter (may come with the soundcard already) that is a 1/4 inch stereo to (2) 1/4 TS MONO.
You may need some adapters to accomplish this.
Be back soon. Good luck.
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