jsfx prefered, of course.
Example:
A track with kick playing, replace those kick hits with another sample.
You can replace kick with any word you like, same principle.
Where to use it?
Example: Filther, at higher resonance values it gives hi-pitched piiip tone, so this tone we could replace with some other sample of our choice, example beautiful sounding dusty noise sample. see filther issue/suggestion:
https://github.com/JoepVanlier/JSFX/issues/6