Layering, Tuning and the Kick–Bass Relationship

Once a pattern grooves, the next step is making it sound finished. Most of that happens in three places: layering sounds to get the tone you want, tuning drums to the key, and managing the low end where the kick and bass meet.

Layering drums

Layering means playing two or more samples together as one hit. The goal is to take the best part of each: the click of one kick with the body of another, or the crack of a snare with the room of a clap.

Layer by frequency band

Give each layer a job and filter it to that job:

Layer	Job	Filter
Kick top	Click / attack	High-pass at ~150 Hz
Kick body	Weight	Low-pass at ~150–200 Hz
Snare body	Thump	Low-pass at ~1 kHz
Snare top / clap	Crack, noise	High-pass at ~800 Hz–1 kHz

When layers do not overlap in frequency, they cannot cancel each other.

Watch phase on low layers

Two low-frequency sounds that start at slightly different points in their waveforms can partly cancel, leaving a layered kick weaker than either alone. If a layer makes the kick thinner, flip one layer's polarity or shift it by a millisecond or two and listen again. Better still, only let one layer carry content below about 150 Hz.

Align the transients

Each layer must start exactly together. A few milliseconds apart and the hit flams, sounding like two hits instead of one. Trim each sample to its first transient, as in the first lesson.

Tuning drums to the key

Kicks, toms, 808s and many snares have a pitch. If that pitch clashes with the song's key, the low end sounds muddy even when the levels are right.

1. Find the song's key. If you are working to a sample or reference, the key and BPM finder will tell you.
2. Find the drum's pitch. Solo the kick and look at the strongest low peak on a spectrum analyser, or play it against a sine tone and tune until they stop beating. The online tuner works on sustained tones like 808 tails.
3. Pitch the sample to the root or fifth of the key by changing its playback speed, as a sampler's tune control does, rather than with a pitch-shift effect, which tends to smear the attack. The root is the safe choice and sounds solid; the fifth sounds slightly brighter and less heavy.

A rough pitch-to-frequency guide for the kick range:

Note	Frequency
E1	41 Hz
F1	44 Hz
G1	49 Hz
A1	55 Hz
B1	62 Hz
C2	65 Hz

Snares and toms matter less but still help: tuning toms to notes of the chord makes fills sound musical rather than random.

The kick and bass relationship

Kick and bass both live below about 120 Hz. If they play at the same time at full level, they add up into a boomy blur and steal headroom from the whole mix. There are three standard ways to share the space.

1. Split the frequencies

Decide which one owns the very bottom. In house and techno the kick often owns 40–70 Hz and the bass sits slightly higher at 70–150 Hz. In trap the 808 owns the sub and the kick is a short click on top, or there is no separate kick at all.

2. Split the time

Write the bassline so it avoids the kick. The classic house bass plays on the off-beats (steps 3, 7, 11, 15) between kicks. In techno a rolling bass often fills the three 16ths after each kick and leaves the kick's own step empty.

3. Duck the bass with sidechain compression

Route the kick to a compressor on the bass so the bass dips briefly each time the kick hits. A fast attack, a release of 50–150 ms and 3–6 dB of gain reduction is a reasonable start. Push it further for the audible "pumping" of French house and EDM.

Check in mono

Bass and kick should be mono, or close to it. Collapse your mix to mono and check the low end; if the kick or bass gets weaker, something is out of phase.

Putting it together

For a finished drum and bass foundation: one kick with one layer carrying the sub, tuned to the root; a snare built from a low body and a bright top; a bass that either avoids the kick in time or is ducked by it; and everything below 120 Hz mono. That is the base the rest of the arrangement sits on.