ReaFir may work since it can create a noise profile and filter that out.
Just a tiny nitpick... the actual preamps aren't digital, they are purely analog but sitting near digital devices and potentially picking up noise from nearby components or a noisy ground plane since combining digital and analog and similar grounds can cause digital noise to find it's way into the analog signal.
Of course the real solution is a sound card that exhibits less of this effect or a dedicated preamp etc.
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Music is what feelings sound like.
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