The Gustard fuse with the Arctic MX-5 heatsink compound is DEAD SILENT. It has a very calm acoustic pattern, and has gobs of resolution, voices sound extremely convincing.
I have tried bypassing my fuses altogether, temporarily with copper foil, and these moddded ones sound very close to a bypass. I don’t think I am missing much, but then again a breaker is something I’d like to try out for sure.
The timbre/tonality of the fuse is dependent on the outside cap more than anything else, and there is room to play on that front.