recording what I hear

I am attempting to record what I hear from my speakers, specifically a demo version drum machine composition. I can play it back but with demo cant save or export…was hoping to simply record what is coming out of the speakers…high frequency noise only, tried sond mapper and mic settings, mme and variations of the above…when attempting to record off youtube just to see…I see monitoring bars active but flatline in track record bar…tried varying levels…still either nothing or very faint or that high frequency noise…hmmm

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