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Interesting note about your professor. It's been a number of years since I did analog audio circuit design, but I remember one rule of thumb from the articles I read in the "hobbyist" DIY audio publications: avoid tantalums in your signal path.
It was a long time ago (almost 15 years) so I could be mis-remembering the type of capacitor. (Maybe he was replacing ceramics with electroyitics???). This particular professor had actually worked as an AMP designer in the real world, and was pretty good at that Black Magic they call analog circuit design.

Can you remember why Tanalums are so bad? A Residual DC voltage shouldn't make much of a difference to an AC signal, and I find it hard to believe inductive effects are prevalent at 20Khz.
Is it current leakage? Just curious. (Mostly because I am pretty sure it was tantalums he was using...)