I really don't think any of this is going to work, tho
Are you capturing the samples from the "what you hear" of your soundcard, or is that from the analog out? Maybe the physical jack is short-circuiting (grasping at straws here, I know).
You're probably going to have to just get a new sound card. Even a $20 SB with the high noise floor is better than this!
hope this helps
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