Why an 808 has to be in key
An 808 is a kick and a bass note at the same time. The attack does the kick's job, but the tail rings at one pitch for hundreds of milliseconds, often longer than a beat. If that pitch isn't a note in your track's key, it rubs against the bassline and the chords, and the low end sounds muddy or "off" even when the levels are fine.
The usual approach is to tune the 808 to the root note of your song, then play it from a sampler so each hit can take a different note from the scale. That only works if you know the sample's real pitch. An 808 that is 20 or 40 cents flat is out of tune on every note you play from it. Each card above shows the original pitch to the cent, and choosing a key corrects any offset as well.
Why this sounds better than pitching a sample
Pitch a sample up in most samplers and it plays back faster: the tail gets shorter and the click gets thinner. Pitch it down and everything stretches and smears. Nothing is resampled here. The 808 is synthesized again with its pitch curve moved to the new note, so the click, the attack and the length stay exactly as designed. The move is never more than half an octave, so an 808 stays in the register it was built for.
808 note frequency chart
Most 808 tails sit between about 27 Hz (A0) and 65 Hz (C2). Use the chart to set a sampler's root note or to check where an 808 lands. Frequencies use standard tuning, A4 = 440 Hz.
| Note | Frequency | 808s here as designed |
|---|
| A0 | 27.50 Hz | |
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| A#0 | 29.14 Hz | |
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| B0 | 30.87 Hz | |
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| C1 | 32.70 Hz | |
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| C#1 | 34.65 Hz | |
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| D1 | 36.71 Hz | |
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| D#1 | 38.89 Hz | Deep Sub Boom |
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| E1 | 41.20 Hz | Trap 808, Zaytoven 808 |
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| F1 | 43.65 Hz | Tuned 808 Body |
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| F#1 | 46.25 Hz | |
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| G1 | 49.00 Hz | |
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| G#1 | 51.91 Hz | |
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| A1 | 55.00 Hz | |
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| A#1 | 58.27 Hz | |
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| B1 | 61.74 Hz | |
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| C2 | 65.41 Hz | |
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How long should an 808 be?
Long enough to carry the note, short enough to stop before the next one starts. When 808 notes overlap, the tails stack up: the low end gets louder and muddier, and two different pitches ringing together clash. Most producers set the sampler to mono, one voice, so each new hit cuts off the last.
A quick check: one beat lasts 60,000 / BPM milliseconds. An 808 that plays on every beat can ring for about that long without overlapping itself. Longer tails suit sparser patterns, or get cut short by the sampler's release.
| Tempo | One beat | Half a beat |
|---|
| 70 BPM | 857 ms | 429 ms |
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| 90 BPM | 667 ms | 333 ms |
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| 120 BPM | 500 ms | 250 ms |
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| 140 BPM | 429 ms | 214 ms |
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| 160 BPM | 375 ms | 188 ms |
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For reference, the 808s above ring for 1.14 s (Trap 808), 3.14 s (Zaytoven 808), 834 ms (Tuned 808 Body) and 1.19 s (Deep Sub Boom), measured until they fall below -60 dB.
Making an 808 audible on phones and laptops
Small speakers barely reproduce anything under 100 Hz, so a pure sub 808 can vanish on a phone. The fix is harmonics. Saturation or distortion adds energy at two, three and four times the fundamental, and the ear fills in the missing low note from those overtones. That's why the Zaytoven 808 adds harmonic content and drives its output stage, and why the Deep Sub Boom is the one to reach for when something else in the track already covers the top end.
Using an 808 with a separate kick
If the beat also has a kick drum, the two fight over the same low frequencies every time they hit together. Common fixes: tune the kick's low end to the same note as the 808, keep the kick short so its tail is gone before the 808's sustain takes over, or sidechain the 808 so it ducks for a few milliseconds under the kick. Or skip the separate kick. The Tuned 808 Body has its own body and click layers and does both jobs.