i thought i would contribute to this thread that i started two years back.
this is from modernbeats courtesy of shootingblanks
Quik Tipz: Find tha Kick's Tonal Resonance
By ModernBeats.com
Sometimes it may be difficult to identify which musical note or key the kick is resonating at. For an easier method in figuring which note/key the kick is resonating, temporarily transpose or pitch shift the kick sample to exactly one octave above it's root pitch. This will allow you to more easily identify the kick's key because mid to high frequency pitches are easier to discern when compared to low frequency pitches.
For further clarification of the kick's true key, you can transpose the kick's pitch up 1 additional octave and then sweep its pitch back down in octave-by-octave increments, confirming that each octave reveals the same resonating note/key as the other 2 octaves. With this greater span of referenced pitches across 3 whole octaves, you can be confident you are accurately identifying the kick's tonal resonance and key.
Lastly, upon identifying a kick's pitch, you may find the kick does not resonate exactly 100% over it's closest note or key. We highly recommend adjusting the pitch using "cent" values until the kick's peak resonance lands over the nearest musical note exactly. Repeat the above procedure for all the kicks in your production until you have identified the resonating note of each kick used.
After going through the motions a couple of times, you will no doubt have become a pro at pinpointing ANY kick's tonal resonance! Stay tuned for exciting additional tips on becoming an expert at matching a kick's tonal resonance EXACTLY with a song's key while eliminating hard to find bass conflicts!
In short, tune your drums