[Bogo]

Originally Posted by Iamblichus

Here is a link where different cap types were tested
http://skguitar.com/

Finally some tests where someone had the caps switched instantly while playing.
The different material caps do have different measurable characteristics but equating them to audible differences in this particular application never seems to have been proven beyond doubt. Then there's the even more subjective determination as to what any subtle sonic differences mean in terms of more accurate or pleasing sounds.