Nick Gorham wrote:

This might be of interest

No they don't. But only crappy ones.

High-K ceramics are fabulously non-linear. Med-K ones are only slightly
better. But no competent designer would use them in an audio path.

As for plastic film dielectrics, I doubt STRONGLY there's even any
remote hope of an audible difference.

However using the right VALUE and considering TOLERANCES is VERY
important and may mislead people into wandering up blind alleys.

Heck, even zero-bias electrolytics are audibly blameless when used
corrrectly. That's where an experienced designer's skill counts.

Graham