Another thing to check.
In the task bar at the bottom there is a speaker icon. If you double click it, it should open an advanced volume control. See if any of the sliders are at the bottom or if the mute button is checked. I've been known to mute certain sounds while recording audio into my computer. (Spent 8 years converting a vinyl record collection into digital!) If you go to the options tab, you can also adjust levels for audio inputs. Good luck!
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