That gives everyone else in the home a break.

Do it on a regular enforced schedule. He goes to his room for Xhrs a day from Ytime to Ztime and he is quiet. He can babble all he wants, with his door closed as long as no one else can hear it.

And.... enforce reasonable expectations of quiet when he is with everyone else.  If he violates those expecations, break his behavior chain and correct him.  If he reconvenes... explain that he is not being considerate of others and send him to his room, or to stand in a corner, etc...

Lather.... rinse.... repeat.

He is the right age for sentences as well.  Have him sit in a quiet private space and write sentences.  Not just a few, many hundreds or even thousands.

"I will be considerate of others and will not make noice at all unless I am spoken to or am participating in a converation."

All in perfect hand writing, perfect grammar, and perfect spelling at a rate that allows for him to do nothing but write.  

Make it a point to engage him in appropriate conversation and talk about things he is interested in.   Consider activities with him that will allow the two of you to engage in non tense interface.  

My SS and I used to go for what we called "Johnny Quest Adventures" while his mom was in Grad school and then studying for the CPA exam.  We would go for hikes looking for foscils, we would go rock scrambling, climb trees, etc....   When both his mom and I were in school, I would take him to Kid's Space to run amok with other kids while I studied did my reading, etc.... so his mom could have quiet time.  Earplugs helped a ton with that.

Mix it up, set and enforce behavioral standards, and coach him on appropriate vocalizations.

Good luck.

And break it out ONLY when Dad is around.   Lock/hide it when dad leaves the house.   If he questions why he can't have it when dad is not around, you can say you want him to sing for daddyyyyyyy.

YSS used to be like this constantly miming for attention, parroting TV dialogue to the point where I thought the house had an echo, yakking to himself, making strange noises, banging against the wall, fidgeting with objects to make noise. 

  Following his dad around the house even into the bathroom, coquettishly looking over his shoulder and batting his eyelashes at dad/ observing if he is getting attention or not. 

I am THE EXACT same way. 
 

I realized that after living as a single woman with a home trained bio that living with skids with no home training has driven me up the wall EVERY weekend mainly because of the noise level. 
 

I get that kids, Especially the littles, are kinda noisy but zoo and wilderness levels of noise is ridiculous! Like damn is this dude raising wild animals or humans? 
 

Thankfully asking them to use indoor voices, wear headphones on their mobile devices, and putting buffers on the doors they open and close like 100 times a day are some things that have helped here. 
 

Ive also demanded yes demanded that those skids take their noisy selves into their rooms after 10pm. Not about to be continuously disturbed to the point I can't get my needs (sleep) met. 
 

I usually end up just leaving and staying gone as long as possible if/when the noise really bothers me or this dude gets militant and pushes back ("well them watching tv till 2 am with the volume to the max doesn't bother me" ... "well ahole you're not the only resident here, it bothers me when I can get my needs met/can't sleep because of your passive parenting, and if you don't tell them to turn the loud tv off and go to their room then I will) 

I was pretty heavily disengaged from my SDs. However, if it was something that directly effected me, it was all on. I would usually give DH a warning and explain why. Then I'd follow through with my corrections consistently and firmly. And if DH complained I'd remind him we had talked about it and that he chose to do nothing. He was under the impression that I was some horrible authoritarian but really I just was firm. He had Zero expectations, rules, or teaching moments so of course, anything I did, even the most small thing like expecting them to set the dinner table, was seen as horrible. Whatever.

Ugh. Yes. Going through this everyday with my SD12. She's at the phase where she constantly has to be flapping her lips and downright YELLING and SCREAMING, making obnoxious sounds; animal sounds, barking, screeching, squealing, snorting.

She comes home from school (unfortunately gets off her bus at our house everyday of the school week even though she's only supposed to be here two days a week) and there's 3 hours of her being here while she waits for her mom to pick her up after she's done with work and when I say she is on the phone with her friends absolutely being crazy the entire time I mean it. 

If it's not sounds she's making with her mouth it's crashing things around, stomping, thrashing herself around for dramatic effect while she's talking to her friends and it's enough to make me flinch and just peirces my ears.

One day when my DH came home and heard some of it he looked at me funny then I said "yup, this is what I listen to non-stop for three hours a day" and his response to me (he always thinks I'm too harsh) is "Well I'm sure you drove your own parents crazy doing these same things."

He just doesn't get it.

You have this kid every day. You can't deal with this 24/7. I agree, tell DH either he takes care of it or you do. Taking away electronics is the best consequence at that age. I agree that he should spend time in his room or outside. That's what we did as kids. We weren't in our parents' spaces all the time.

In today's childcentric society, when someone divorces they are told things like "The kids always come first!" "As long as the kids are happy, that's the main thing!" People are told that even though they may have failed as a partner, they can still be a good parent as long as the kids are happy."

The thing is, giving a kid what they want when they want it, failing to teach them self-control or social skills, these things do not lead to true happiness and contentment in a child. You see the results of this. The more you blindly say "yes", the more the kid wants. They are never truly satisfied so they push and push for more. Parents drive themselves crazy trying to see to it that the kids are constantly happy so the kid never learns how to entertain himself/herself, never learns to be satisfied with anything. The bioparent is exhausted and any stepparent in the mix will be angry and resentful. Now nobody is "happy."

"Please stop making noise or go in your room with the door closed or outside." The kid might actually find he has more friends if he is less annoying. He may develop some creativity or the ability to self-entertain. 

Is rough, noisy and LOUD!  The ferals were/are huge for their age (vertically and horizontally).  SD at age 8 literally ripped a glass shower door off of its hinges (CRASH!)

Noise canceling headphones and a white noise machine will be your friends - as a place to start.

Does your SS have ADHD perhaps? Is it being treated? If he's not ADHD and doesn't have any other issues, have you considered counseling? Maybe a professional who is paid to hear him talk once a week can get to the bottom of it. There has to be some kind of strategy to teach him new behaviors. I would likely shut off video games and access to TV or Internet in exchange for him being quiet for a set period of time. Maybe 30 mins of quiet - no talking - equals 30 minutes of Internet/Games/TV. Or 30 mins of outside play gets the same. Your husband should be the one enforcing this. It shouldn't be your job to change this behavior.