'it sounds so much' is correct and usable in written English.
You can use it to express how much something sounds. For example, "It sounds so much better when I play with the band."
In a recent Pepsi Max advert, a man in braces, a henley shirt and black rimmed glasses purrs the line "it sounds so much better on vinyl", before being drenched in a wheatgrass milkshake as a comeuppance for his effete declaration.
To Malcolm, it sounds so much easier.
"It sounds so much fancier when you call it cheval".
It sounds so much like them, but is also challenging.
It sounds so much better in French, doesn't it?
After all, he added, it sounds so much like "You're in Town".
He was shot dead, buried at sea, and the White House held its breath: it sounded so much like a sigh of joy, exhausted and necessary.
"It sounded so much like how my head worked".
I don't know if he meant to make me laugh with this line of comfort, but he did, because it sounded so much like his irreverent self.
You know you could have made it sound so much better.
It sounded so much like a Sam Cooke song that I couldn't use it--it was like the Sam Cooke song that Sam Cooke didn't do.
