Carbon composite, metal film, metal foil, wire wound, and more. For a signal path are there worthwhile differences? I would like to know.

I've dabbled with resistors in the guitar amp area - different application of course because you typically want an amp to be colored and effect the guitar tone...where as with our two channel listening amps you want the electronics to get out of the way. I know that resistors do have say in your end sound. Warmer, colder, analytic, dead/flat.

I've seen Steve use what look like modern carbon comps in the signal path, and I've seen photos of his amps with Dale/vishay in them. I've not really paid attention to where or why. Steve's already worked that out for *his* amps.

Different type of resistors have different applications. You'd totally use a non-magnetic wire wound for a power supply application, but not in the signal path (I don't believe).

Here is a photo of my ZMA when it was getting the balanced inputs added. You can see it's rife with carbon comps. I see a metal film in what I believe is a power to the tube application, and I could be wrong but those little blue resistors are probably going to the meters or something.