Strip trailer sound design down and you’re left with about five noises: braam, sub hit, riser, downer, and some uneasy tension humming under it all. Serum 2 handles every one of them without breaking a sweat, and you won’t need to hire an orchestra for any of it.
Below is my recipe for each, focused on the settings that actually change the result.
Braams: the big brass blast
Strip the mystery away and a braam is just a stack of detuned saws pitched an octave or two below where common sense says to play it, plus drive and a slow attack. Yes, the Inception noise.
- Start with two saw oscillators and crank the unison (at least 7 voices) with the detune spread wide.
- C1–C2 is the sweet spot to play it. Go lower and small speakers turn it to mush.
- Set the amp attack to 100–300 ms so the note blooms rather than just starting.
- Put distortion after the filter. Drive it until the midrange starts to honk, then pull back slightly.
- A lowpass sitting around 2–4 kHz keeps the whole thing dark and weighty.
Here’s the bit nobody tells you: what makes it read as “brass” is a filter envelope opening a touch while the note swells, cutoff climbing in step with the amp attack. Leave the filter static and your ear hears strings; let it bloom and your ear hears brass. One modulation routing, that’s the whole difference.
Sub hits and booms
At its core a boom is a sine with a rapid pitch fall. Send an envelope to coarse pitch, begin somewhere around 70–90 Hz, and let it drop to 35–45 Hz across 100–300 ms. Then stack a short click or a burst of noise on top to give the hit a leading edge.
The mistake I see constantly: stretching the release. Soloed, it sounds huge. In the cue, it’s mud. Cut the synth tail short and hand the size job to a big reverb: a reverb tail tucks in behind the mix, while a raw sub tail sits right on top of it.
Raw analog one-shots make excellent layering fodder underneath synthesized booms. These Minimoog FX recordings, for instance:
Tension risers
The classic riser formula is three ingredients: noise, pitch, acceleration:
- Run a noise oscillator into a resonant filter and sweep the cutoff upward across 8 bars.
- Add a tonal layer that climbs a full octave over that same span.
- Chop the volume with an LFO and automate its rate from 1/4 to 1/16 as the riser builds.
That third ingredient is what most people skip, and it matters more than the other two: speed reads as tension better than pitch ever does. When a riser accelerates, it sounds like something closing in. When it only climbs, it sounds like a slide whistle drowned in reverb.
Downers and whooshes
Now flip everything. The pitch drops, the filter shuts, the energy bleeds out. There’s a lazy trick that never fails: bounce your riser to audio, flip it backwards, and place it after the hit rather than before. Follow a big impact with a downer and suddenly the silence behind it sounds like a choice, not a gap.
Tension beds
Beneath all of that lives a quiet texture that refuses to relax. It’s the job Serum 2’s granular and spectral oscillators were built for: take a vocal, a string sample or a scraped bit of metal, smear it into a slow blur, then modulate it almost imperceptibly. The spectral side gets full treatment in the spectral oscillator guide, and I went deep on sustained textures in the ambient drones article. Really, a tension bed is a drone with bad intentions.
Need starting material? The free Serum 2 presets have pad and stack patches that gut nicely for braam duty: trade the wavetable for a saw, shift down two octaves, hit it with drive.
In a hybrid cue, a pad with slow motion inside it covers the same ground. Here’s the kind of thing I mean:
Making hits sound expensive
What separates a stock boom from a trailer boom usually isn’t the patch at all. It’s contrast. Slam the tension bed down at the point of impact, let the reverb tail run longer than the hit it follows, and carve out genuine silence (100 ms is enough) just before the downbeat. The loudness lives in what you take away.
If scoring is a regular gig for you and you want a shelf of starting points, the Serum 2 preset bundles make practical sense. What you’re getting is raw patches to twist into cues, not ready-made trailer music, and that’s precisely their strength.
FAQ
What note should a braam hit?
Whatever the root of your cue is, typically near C1. Going lower? Stack a copy an octave above so the pitch still survives on small speakers.
Why does my riser feel weak?
Because pitch is the only thing moving. Bring in filter motion plus a rhythmic chop that speeds up; the acceleration delivers more tension than the climb itself.
Is Serum 2 enough for trailer work?
For everything synthetic (braams, booms, risers, beds), absolutely. Organic textures and orchestral colors still call for recorded material. My usual split: bed and pad layers come from the whole Serum 2 preset library, the organic stuff gets recorded on its own.
Mono or stereo for the sub hit?
Mono, no exceptions. A wide sub collapses ugly in mono fold-down, and cinema playback will make you pay for it.
Make these five sounds once, save the template, done. Nearly every trailer cue is the same five gestures shuffled around — the skill lives in the timing, not in rebuilding the braam from scratch each week.
I run Monosounds.studio and make the packs myself. Ten-plus years of producing, 97+ releases, 16,000+ downloads. Every Serum 2 preset we ship passes a CPU check on a mid-range laptop and gets used in a real track before release. If it does not survive a mix, it does not go in the pack.
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