Building a Drum Kit From Synthesised Sounds
A drum kit is the most useful thing to build from scratch, for two reasons. Drums are simple enough that the physics is easy to follow, and they are the part of a track people notice first. This is a walkthrough of a full kit — kick, snare, hats, clap, toms — with actual numbers rather than vague advice. Nothing here needs clearing, because nothing here was recorded.
The kick: it is all in the pitch drop
A kick drum is a sine wave whose pitch falls fast. That is genuinely the whole thing.
Start at around 120 Hz and fall to 45 Hz over the first 40 milliseconds, then hold. The ear hears the drop as impact rather than as a note, because it is too fast to follow as pitch. Make the drop slower and it turns into a tom. Make it faster and it turns into a click.
Three numbers to adjust. The start frequency sets how aggressive it feels — 200 Hz gives a hard trap kick, 90 Hz a soft house one. The end frequency sets the note, so tune it to the key of the track; 45 Hz is roughly F#1. The drop time is the character: 20 ms punchy, 80 ms round and boomy.
Then layer a click on top. Two milliseconds of high-passed noise above 2 kHz is enough. Without it the kick disappears on phone speakers, because those speakers cannot reproduce 45 Hz at all — the click is the only part that survives, and it is what makes people still perceive a kick.
The snare: two sounds pretending to be one
A snare is a tuned drum body plus a rattle of wires underneath, and it must be built as two separate layers.
The body is modal: two or three sine waves, typically around 180 Hz and 330 Hz, decaying in about 150 milliseconds. Those frequencies set the pitch of the drum. The exact ratio matters less than the fact that they are not a whole-number multiple of each other — that slight dissonance is what makes it read as a drum rather than a bass note.
The wires are noise, band-passed somewhere between 1 kHz and 8 kHz, with a decay of 200 milliseconds or so. Longer than the body, which is why a snare tail hisses after the thump has gone.
The mix between the two is the entire personality of the snare. Body-heavy gives you a deep, wooden hit. Noise-heavy gives you the bright crack of a trap snare. Sweep between them and you cover most of what a sample library would offer.
The hats: one sound, two lengths
Hats are the easiest thing in the kit and the fastest way to get a result you like.
White noise, band-passed around 8 to 10 kHz, with a decay envelope. Under 60 milliseconds is a closed hat. Around 300 milliseconds is an open one. That is the only difference.
One detail separates a synthesised hat that works from one that sounds like a hiss: the filter needs a slight resonance and a very short downward sweep at the start, maybe 10 milliseconds from 12 kHz to 9 kHz. Real cymbals are metal, and metal has modes. That tiny sweep hints at them without you having to model them properly.
A practical trick: build one hat and use it for both. Randomise its decay by ±10 percent per hit and vary the volume slightly. Human hi-hat playing is never identical twice, and a programmed pattern with no variation is the single most obvious sign of a synthetic drum track.
The clap: it is four claps
A clap is not one sound. It is several people clapping slightly out of time, and if you build it as a single burst it never convinces.
Take your noise burst — band-passed around 1.5 kHz, decay about 20 milliseconds — and trigger it four times, at 0, 12, 22 and 30 milliseconds. Each one slightly quieter than the last. Then add a fifth, longer tail of about 200 milliseconds underneath to act as the room.
Those spacings are what makes a clap a clap. Space them evenly and it turns into a flam. Space them too far apart and it becomes four separate hits. The uneven, compressing gaps are the sound of a group of people almost synchronising.
The toms: kicks that keep their pitch
A tom is a kick with a slower pitch drop and a longer body.
Start around 200 Hz, fall to 100 Hz over 150 milliseconds — roughly four times slower than a kick — and let the body ring for 400 milliseconds or more. Because the drop is slow enough to follow, a tom reads as a pitched note, which is why toms carry fills and kicks do not.
Build three at 200, 150 and 110 Hz for high, mid and floor. Add a small amount of noise on the attack, decaying in under 10 milliseconds, for the sound of the stick hitting the head.
Making it sit together
A kit built from perfect, isolated synthesised sounds sounds wrong. It is too clean — nothing shares a space, so nothing sounds like it is in the same room.
Three things fix most of it.
First, a short reverb on the whole kit rather than on each piece. Around 400 milliseconds, mixed low. It does not need to be audible as reverb; it needs to make the pieces agree about where they are.
Second, light saturation across the kit bus. Real drums are recorded through microphones and preamps that add harmonics. Synthesised drums never went through any of that.
Third, timing and velocity variation. Nudge hits a few milliseconds either side of the grid and vary the velocities. Machine-perfect placement is only right if machine-perfect is the point.
Why bother, when packs exist
Two honest reasons, and one that is not a reason.
The first is ownership. A synthesised sound has no source recording and no source composition, so there is nothing to clear. Anyone releasing commercially knows that a sample of unclear origin is a liability that surfaces at the worst moment.
The second is that it is yours. A pack that sells five thousand copies puts the same kick under five thousand tracks. A kick you built is in exactly one.
The reason that is not a reason: speed. Building a kit from scratch is slower than opening a pack, and it stays slower. Most producers do both — packs for pace, synthesis for the pieces that need to be their own.
Common questions
Which synth should I use for this?
Any synth with a pitch envelope and a noise source, which includes the stock instruments in FL Studio, Ableton and Logic. Dedicated drum synths make it faster but change nothing about the method.
Why does my kick disappear on phone speakers?
Because phone speakers cannot reproduce anything near 45 Hz. The click layered on the attack is the only part they can play, so it has to be there. Always check a kick on a small speaker before deciding it is finished.
How do I make synthesised drums sound less sterile?
Vary the timing and the velocity, put the whole kit through one shared reverb, and add light saturation. Sterility comes from everything being identical and from nothing sharing a room.
Can I release music made this way commercially?
Yes. Nothing was recorded and nothing was sampled, so there is nothing to clear.
Want the drums without the build
VXR OPS is built on the principles in this article. Royalty-free, WAV, ready for any DAW.