i don't necessarily mean volume here. hard drumming is improv style, play with your ear, don't really follow a specific structure, rhythm, and/or repetition. hard drummers, either clash or pull off some cool timings, rhythms, and whatever else. soft drumming caters to the idea that a song should follow a structure, and be consistent. i consider neil peart to have been a softer drummer because of what he could really do behind drums. he was always reserved and catered to the structure, or the idea of what a song should be. joey jordison being a hard drummer, that most of his older work wasn't catering to any standardized structure but what he created, and formed. a song can either be the same point repeated, or like a story where you have a start to an ending. drummers have to know how to express their talents, while knowing what the music requires. so when one balances hard, and soft styles, you get unique characteristics that are adherent to standardization. this is where tasty drumming is created.