Quote Originally Posted by Soft sign View Post
It can be used.
The form with по- is more colloquial, and it has a shade of meaning of ’a bit’. «Посветлее» — ‘a bit lighter’, «подешевле» — ‘a bit cheaper’.
That's why I said "even louder" (still a bad way to express it, my bad). It's not quite "louder". I feel that it's "louder" and something more.

Yeah, you are right, louder and "a bit" sounds better.

a tad louder/lighter/.../