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Yeah it depends on what sort of noise it is.
If it's loud creaks that are happening when you walk up the stairs then you'll need to get in under the stairs.
The treads and risers are wedged into the stringers. Creaks can be caused by loose wedges that are allowing movement. Get under and check if any wedges are blatantly loose or missing.
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i think a bit of both - i want it to sound less loud overall but also reduce creaks.
I've ordered some small wooden wedges as a first measure to see if I can reduce creaks. Will see how that goes then consider some dampening material on the underside of the treads and risers, then some acoustic caulk (does this actually work?) for the gaps.
Yep. Any specific suggestions for the material?