Thanks. I’m not questioning the results, one way or the other, just wondering why and how it makes a difference. Apparently, in the chip design the different value and material parallel/bypass capacitors are used to push the inductance of the capacitor to higher frequencies and the combined impedance(s) of the capacitors is lowered across a broader frequency range. But that’s at MHz region. I’m guessing the same/similar phenomenon occurs in audio. Otherwise, on the surface you’re just adding the capacitances of the two capacitors.