Good! It's not supposed to sound layered - it's supposed to sound like one thump. The producer sent in two kicks that blended together and had a really cool texture, but the combination made the kick feel a little "soft". So I dubbed in a really hard attacky kick - which made it nice and hard, but seemed to detract from the low end. So I added a triggered sine wave. I'm pretty meticulous about dubbing in my own drums into other people's production - I don't want it to sound like I've actually changed their drums.
As a general guideline when I blend drums together, especially kicks, I want to sit back and say "that sounds like one monstrous kick drum."
As for Ronnie, Ronnie had a hit out called "Be My Baby" in the sixties. She was in a group called The Ronnettes. She later married Phil Spector (crazy wall-of-sound producer guy, who's in jail for murder now). That was a nice situation because my sole job was engineering - there was a producer, an arranger, song writers, musicians - everyone just stuck to their specialty.
