My question involves landlord-tenant law in the State of: WI
I am a landlord who rents out the top and bottom of a duplex. We have had the same tenant in the downstairs for the 15 years that we lived in the upper and had no issues. We bought a single family and had two people move in to the upstairs a year and a half ago.
Upstairs tenants are now telling us that the downstairs tenant is getting increasingly aggressive with verbal threats, expletives, pounding hard on ceiling and walls because he says they are making "abusive amounts of noise". He said they stomp, not walk; bang cabinet doors, drop things, play their tv too loudly...they have purchased area rugs, moved much of their tv and stereo equipment to third floor, use back door at night so as not to walk over his bedroom; but he still says they make too much noise. when he bangs they try to call him or go down to talk but he wont answer.
We got involved because they felt threatened, we asked the downstairs tenant for his side, he said they are rude, abusive with noise so much as he can hear the shower running in the morning, coffee cups being placed on the table, etc. We have asked that he call us when he hears this and we will come over to listen and see how bad it is; he says this will be difficult because it can be sporadic.
Our question: how does this get resolved? How involved do we as landlords get? If they are feeling threatened, is that us or the cops that should be responding? I've seen a lot of info for landlord/tenant disputes but not alot on how landlords should be dealing with tenant/tenant disputes such as these.
It seems clear the downstairs person would really like them to leave and we are worried that if they do, the next people that move in will also be subject to this. We have discussed reasonable living noise with him because its a fact of life when you live under people you will hear footsteps and such but he says it is so loud its obviously being done on purpose. without being able to hear it - what can we do?
Thanks for any assistance you can give - and the more legal the better so we know where we stand or need to stand.

