If your risers do not add enough tension, or you keep using the same samples everyone else uses, design your own. A good riser does more than sweep upward: it gets more unstable, faster and wider as it climbs. Here is how KOOROW builds one from scratch in Serum, without samples.
The video is in Persian. This article walks through every step in English.
The idea in one line
A riser, or its opposite the downlifter, is upward movement: modulation that rises over time on pitch, filter cutoff and effects. Tension comes from making that rise less linear and more unstable as it goes.
Step 1: Decide the length and write one note
Decide how long the riser should be. In the video it lasts 8 bars. Write a single note 8 bars long and switch the clip’s loop off, so the riser plays once from start to end.
Step 2: Choose a rich wavetable
A saw is the obvious choice, but it has been used so much that it is worth exploring other wavetables. Look for one that gets denser as you move the wavetable position: more harmonics, a fuller and brighter top end. In the video the position sits around 90–92. Experiment and follow the same pattern with your own sounds rather than copying settings exactly.
Step 3: Pitch rise with LFO 1 in envelope mode
- Set LFO 1‘s rate to 8 bars to match the note.
- Assign it to coarse pitch, and pull the oscillator’s own pitch down so there is room to climb.
- Switch LFO 1 to envelope mode. It then runs once and does not restart, so the pitch rises across the 8 bars and stays at the top.
This gives you a simple rising sound: a starting point, not a finished riser.
Step 4: Break the straight line
A perfectly linear rise sounds predictable. Make it more interesting:
- Add a Sync warp mode on the oscillator and let LFO 1 drive it, so the tone changes as the pitch climbs.
- Add some unison (around 4 voices) with a small detune for size.
Step 5: A filter that speeds up as it rises
- Turn on the filter. A low-pass or band-pass filter works. Avoid high-pass here.
- Set LFO 2 to a Hz rate and assign it to the cutoff, so the filter opens and closes.
- Now the key trick: route LFO 1 to LFO 2’s rate in the mod matrix (about 34% in the video). As the pitch rises, the filter movement gets faster too.
- Want a bigger peak that screams more at the top? Increase those matrix amounts.
- Add a fair amount of resonance and a moderate amount of drive.
Step 6: Effects that grow with the riser
You can use Ableton’s audio effects or Serum’s own. In the video everything stays inside Serum:
- EQ: cut the lows and smooth the top a little.
- Delay, then reverb. Use them deliberately. Do not just drop them on and leave them static.
- Set the reverb mix to 0 and modulate it with LFO 1. As everything rises, the sound becomes more reverberant and moves further into the space.
- Leave the delay mix at around 20% and let LFO 1 add roughly another 20% as it climbs.
If you do not like the “wah” quality, it comes from the high resonance. Turn it down.
Step 7: A second layer halfway through
For extra tension, bring in another movement partway through. Assign LFO 3 to coarse pitch with a ramp shape, set its range, and give it a 4-bar delay. On an 8-bar riser, the new rise starts halfway, right when the listener expects the build to settle.
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