Just to illustrate the use of ceramic multilayer caps in a gainy pedal like the Musket Fuzz:
There are if I'm not wrong 13 ceramic multilayer and 3 ceramic disk caps. The pedal is all the silent that a Big Muff can be, and no way noisier than my other Big Muffs built with polyboxes or greenies.
The tone is superb and verbatim to the original, so use these caps with no concern.
The ceramic disks until 500- 680pf use to give no noise problem. Bigger values are sadly noisy by nature, but even the orginal Musket uses ceramic disks for these low values and some of the 100nf ones.
BR