Serum 2 Filters: A Practical Guide to Sound Design

A filter can do much more than make a synth darker. In Serum 2, it can turn a plain saw into a talking bass, add a metallic pitch to a square wave, make a pluck feel rubbery, or give a sustained note movement without changing the oscillator.

The trick is knowing which filter family gets you close—and which control to move once you get there.

This guide takes you from everyday low-pass filtering to combs, formants, Diffusor, and the drawable PZ SVF. You’ll hear short examples throughout, see the relevant controls up close, and finish with a few focused exercises you can use in your next patch.

Adapted from John’s EDMProd video, Serum 2’s Filters Are Insane (Here’s How to Use Them). Screenshots, animations, and listening excerpts come from that demonstration. Additional exercises and technical clarifications expand the lesson; they are starting points, not exact preset recreations.

Before you start: Open Serum 2 in your DAW and load an initialized patch. If the overall interface is new to you, start with our Serum 2 beginner’s guide. This lesson focuses on the synth’s Filter 1 and Filter 2 modules. Serum 1 shares many of the older filter types, but the newer models, dual-filter workflow, and screenshots here use Serum 2.

Listening note: These are excerpts from a continuous sound-design session, not a controlled, loudness-matched shootout. Notes, settings, routing, and occasional effects change. Start at a comfortable playback level, and use each clip to hear the behavior described beside it.

1. Choose a filter by the sound you want

Don’t begin by auditioning every menu item. Start with a specific job: soften a bright sound, reveal a harmonic, create movement, or change the sound’s texture. Then compare two or three related models with the same oscillator and MIDI phrase.

The video’s menu groups the filters into Normal, Multi, Flanges, Misc, and S2 Filters. Those categories help you browse, but they aren’t a musical rulebook. A filter from the “Misc” group can be the central ingredient in a bass patch.

For a broader explanation of the basic shapes, see our audio filters guide. Here, we’ll concentrate on what to do with them inside Serum.

2. Set up the signal path before judging a filter

A filter only changes the audio that reaches it. If Cutoff seems to do nothing, check routing before choosing a more extreme model.

1. Enable one oscillator with a harmonically rich waveform, such as a saw.
2. Enable Filter 1.
3. Check the oscillator’s routing switch under the filter display. A, B, C, S, and N refer to the three main oscillators, Sub, and Noise.
4. Start with Mix fully wet, modest resonance, and low Drive.
5. Bypass other effects while you learn the filter’s contribution.

A saw makes this easier than a sine because it gives the filter more harmonics to reshape. If there’s almost no high-frequency content in the source, opening a low-pass filter won’t suddenly produce a bright sound.

Serum 2 gives you two filter modules. You can use them to treat different oscillator layers or build a more involved signal path through the mixer. For this lesson, get a useful result from one filter first. Add the second with a clear purpose, such as controlling brightness after a character effect. Check the mixer routing rather than assuming that enabling both automatically creates the chain you intended.

3. Understand Cutoff, Resonance, Drive, and Fat

Cutoff and slope: where the sound changes, and how sharply

For a low-pass filter, lowering Cutoff reduces more of the upper spectrum. A high-pass works in the other direction, reducing frequencies below its transition region. Neither is a brick wall: the transition has a shape.

The numbers in names such as Low 6, Low 12, and Low 24 describe the nominal slope in decibels per octave. An octave above a frequency is twice that frequency: 500 Hz to 1 kHz, for example.

A steeper slope generally separates the passed and reduced frequency regions more strongly. A gentler slope leaves more of the surrounding material audible. That’s why a 6 dB/octave setting can remain relatively bright even when the cutoff is low.

Try it: Hold a low saw note and keep Cutoff fixed. Switch between 6, 12, 18, and 24 dB/octave. Listen to the remaining buzz above the note, then adjust Cutoff to make each version musically useful. Don’t assume a steeper setting is automatically better.

A 12 dB/octave slope isn’t “twice as loud” or “twice as filtered” as a 6 dB/octave slope. The number describes how the response falls away, not a simple perceived-intensity scale.

Resonance: bring attention to the moving edge

Resonance makes the filter’s characteristic frequency region stand out. On a low-pass, that often produces the pointed, whistling quality that turns a plain sweep into a squelch.

The low end may change as resonance increases, depending on the model. Judge the complete sound: a dramatic resonant peak can feel exciting by itself while leaving a bass too thin underneath.

Drive: change what enters the circuit

Drive pushes the filter harder. On models with nonlinear behavior, that changes harmonic content as well as level. Two filters at similar cutoff settings can respond quite differently when driven.

These adjacent excerpts demonstrate different low-pass models from the source session. They are brief character examples, not a matched test of which model is louder or better.

When building your own comparison, use the same note, oscillator level, and modulation. After raising Drive, reduce the filter’s output Level if necessary. That makes it easier to hear the tonal difference without simply preferring the louder version.

Fat: more than a low-end compensation knob

Fat occupies the variable-control position beneath the filter. Its function changes when you choose another model, so always read the label.

One useful clarification to the video: for the standard models, Xfer describes Fat as saturation in the resonance path. Treat it as a character control, not automatic gain compensation. It may help you find a fuller result, but use Level to make the final volume adjustment. See the filter section of the official Serum 2 manual for model-specific behavior.

4. Make a filter move across the stereo image and keyboard

Filter Pan offsets the left and right cutoffs

Serum’s filter Pan is different from the oscillator’s ordinary pan control. Instead of simply placing a sound to one side, it gives the left and right channels different cutoff positions.

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A centered setting gives you a sensible baseline. Move it gently in either direction while listening on headphones. The effect is a difference in filtering between the channels; it isn’t just a volume pan.

Add an LFO for motion

Drag an LFO onto the filter Pan control. Keep the base position centered and use bipolar modulation if you want the movement to travel either side of that setting. Begin slowly with a modest modulation amount.

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A slow rate gives an obvious traveling movement. Faster motion creates a different texture. Check the patch in mono as well as stereo, especially if it carries the low end of your track.

You can also lower Mix to blend the filtered signal with the original. This can preserve some of the source’s body while retaining the movement. Because the two paths can interact in phase, a halfway setting is a sound-design choice rather than a guarantee of unchanged bass.

Key tracking keeps the filter related to the notes

Without key tracking, the cutoff stays at its set frequency as you play different notes. That can make the upper notes in a phrase much duller or quieter than the lower ones.

With key tracking enabled, the cutoff moves with pitch. This is especially useful when you tune a Peak or Comb to a particular harmonic and want that relationship to remain recognizable across a melody.

Test the whole phrase. Key tracking gives you a more consistent relationship to pitch; it doesn’t guarantee equal loudness on every note. Highly resonant or nonlinear filters can still behave differently across the keyboard.

5. Build useful sounds with the Normal filters

Low and MG Low: start with an envelope

Low-pass filters are useful for far more than removing harshness. A short envelope on Cutoff can create the bright attack and darker body of a pluck. A slow envelope can let a pad gradually open.

Start with a saw, lower Cutoff, then drag an unused envelope onto it. Give that envelope a fast attack, a short decay, and low sustain. Adjust the modulation amount until each note opens enough to speak, then settles back into the darker tone.

MG Low offers a different character from the Low family. Compare both before adding effects. Sometimes a modest change in the filter model does more than another layer of distortion.

High: separate an upper layer from the sub

A high-pass can reduce low-frequency material in a bright layer while a separate oscillator supplies the foundation. In the video, John combines an upper sound with a low sub and uses filtering to separate their roles.

The routing matters as much as the cutoff. If you want a steady sub, don’t accidentally send it through the same high-pass. Listen to the layers together: a gap between them can sound hollow, while too much overlap can feel crowded. Our sub-bass guide goes further into giving the low end a clear role.

Band: isolate a narrow part of the sound

A band-pass reduces material both above and below its pass region. It’s a useful starting point for a nasal lead, a small radio-like layer, or a moving accent that leaves space around it.

Sweep through the middle of a rich waveform and notice how quickly the identity changes. If the sound is too small to carry a part, use it as a layer or blend some dry signal back in.

Peak: make one harmonic part of the identity

Instead of broadly darkening the sound, a Peak filter can emphasize a particular region. John demonstrates this with a square wave and key tracking.

Hold one note, move Cutoff until a useful overtone stands out, and then play the phrase. Enable key tracking and compare. This is a good way to make a simple waveform feel more distinctive without immediately reaching for another oscillator.

Notch: create movement by taking something away

A notch removes a region rather than boosting it. Move that gap through a harmonically rich sound and the changing balance creates motion.

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For a Reese-style starting point, use a detuned saw sound and a slow LFO on the notch cutoff. Keep the sweep limited at first. Listen for a moving texture inside the bass, then check that the lowest notes still have the weight you need.

6. Use Multi filters for two movements at once

The Multi names tell you which shapes are combined. For example, LP means Low plus Peak in this group, and PP gives you two peaks. Don’t confuse a two-letter combination with the name of an ordinary low-pass filter elsewhere in the menu.

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The main Cutoff controls one region; the second frequency control positions the other. You can use separate LFOs to keep those movements from repeating together too quickly.

Start with one slow movement. Once that sounds good, add a second at a different rate and reduce its depth. If both controls sweep across their entire range, the patch can lose its identity.

The morphing Multi filters offer another approach: blend between different response shapes. Moving Morph can change the kind of filtering as well as its emphasis.

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Try it: Record four bars with a static Morph position, then four with slow modulation. Use the second version only where the arrangement needs extra movement. A filter doesn’t have to move constantly to be useful.

7. Explore combs, flangers, and phasers

These filters are useful when you want a hollow, metallic, sweeping, or strongly colored result. They can change the apparent tone enough that one oscillator feels like a more complicated sound.

Comb: tune the coloration

A comb response has repeated peaks and notches. A delayed version of a signal interacting with another path is a common way to create that pattern. Changing the delay relationship changes the spacing of the response.

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Find a cutoff position that complements the note, then try key tracking. If the effect feels tuned on one note but odd on the rest, this is one of the first things to check.

Positive and negative comb variants change the pattern. They aren’t simply “more” and “less” versions of the same effect. Compare them on the actual phrase, at a sensible output level.

Feedback filtering changes the character

Some comb, flanger, and phaser variants include low-pass or high-pass filtering in their feedback paths. This shapes the recirculating signal; it isn’t the same as leaving part of the original audio completely unprocessed.

Use a lower feedback low-pass cutoff to explore a less bright result, or the high-pass variant when low-frequency feedback is dominating. Adjust Mix as well as the frequency controls. A partially wet setting can produce a very different response from fully wet.

Flanger: sweep the harmonic pattern

Flanging is associated with a moving comb pattern and the familiar jet-like sweep. In Serum, use the selected filter’s controls and modulation to create the movement you want; don’t assume its name means a slow sweep happens automatically.

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Try a restrained sweep over a sustained midrange layer. Then compare a quicker envelope-driven movement for a short effect or fill. The same filter can sit in the background or become the hook, depending on the modulation.

Phaser: a different kind of movement

A phaser uses frequency-dependent phase shifts rather than the same simple delay relationship as a comb. When the affected and dry signals interact, that can create a series of moving cancellations.

More complex phaser variants change the pattern, but don’t read their numbers as though they were the slope of Low 24. Start with the less complex option and add complexity only when the result improves.

Serum also combines phaser and flanger behaviors in some models. Those are worth trying when you want a more obvious texture, but listen in the track before deciding a bigger sweep is the better one.

8. Turn the Misc filters into sound-design tools

This group includes EQ-like shapes, modulation effects, digital distortion, and phase-based textures. The Cutoff knob doesn’t always behave like an ordinary low-pass cutoff here.

EQ filters: reshape a region

The Low, Band, and High EQ options offer another way to rebalance a waveform. Use them when you want to bring a region forward or back rather than simply close the top end.

Listen to the whole note after making a change. A resonant shape that looks helpful on a graph can still pull attention away from the musical part. Keep the setting only if it solves an audible problem or adds a useful character.

Ring Mod: add sidebands and metallic tone

Ring modulation multiplies signals together. A simple example produces new components at the sum and difference of the input frequencies. With a harmonically rich source, that can create a much more complicated, metallic sound.

Start with a low Mix setting. Raise it until you hear an extra edge, then play a melody. Key tracking can help keep the effect related to the notes. The x2 version adds another modulation stage to explore, so introduce it only after you understand the simpler version.

A full-wet result can be useful for an atonal hit or effect. If you’re making a pitched bass or lead, check that the musical pitch remains clear enough for its job.

SampHold: introduce digital grain

The sample-and-hold model creates a rough, digital texture as its effective sampling rate changes. This is different from simply reducing bit depth, even though both can sound deliberately degraded.

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Use a simple waveform while learning this one so the new texture is easy to identify. Then try a small amount on a more complex bass. A little grain can help a layer speak; an extreme setting can turn it into an effect.

SampHold- is the difference variant. It emphasizes what differs between the processed and original signal rather than merely offering a gentler amount. Don’t think of the minus symbol as “less distortion.”

Combs, Allpasses, and Reverb: reshape the texture over time

These models are useful for smearing attacks and adding a resonant or spatial impression. The Reverb filter is a sound-design tool inside the synth, not a replacement for every job you might give a room or hall effect.

An ideal all-pass changes phase without changing its magnitude response. That still matters to transients and to how paths combine. Serum’s more complex combinations, damping, drive, and dry/wet blend can change the result further. A flat-looking amplitude graph doesn’t mean the processing is inaudible.

Try a short note rather than only a sustained one. The attack can reveal the effect more clearly. Use damping to explore a smoother result if the upper texture becomes too brittle.

French LP and German LP: choose by character

French LP is a useful place to explore squelchy, nonlinear filtering. Its secondary resonance control, BOEUF, gives you another interaction to work with alongside the main resonance and Drive.

Make small changes to one control at a time. If a setting becomes thin or disappears, back off the interaction rather than immediately turning up the output.

German LP gives you a different low-pass character to compare on the same phrase.

The useful question is whether the filter gives your patch the attack, weight, and tone it needs. You don’t need to identify a vintage circuit by ear before making a good choice.

Add Bass: experiment beyond the name

John uses Add Bass for an aggressive sound-design example with two sine oscillators at different pitches. The interesting result comes from their interaction with the processing, not just a simple low-frequency boost.

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Begin with the oscillators held steady, then explore Drive. Add movement to one parameter and listen before introducing another. THRU changes the contribution of a phase-rotated dry path, so don’t treat it as interchangeable with the main Mix control.

Save a useful static version first. That gives you a way back if several moving controls turn an interesting bass into an unpredictable sweep.

Formant: make the filter talk

Formant filters emphasize patterns that resemble vowel sounds. A harmonically rich oscillator gives them material to work with, and movement across those patterns creates the talking quality.

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This excerpt includes the short ping-pong delay added in the video. Listen for the vowel movement, then notice how the delay repeats it in space. The delay is part of this example’s result.

For your own patch, start without delay. Find two useful vowel positions, then modulate slowly between them. Add the effect only once the dry phrase works. The different Formant models are worth comparing on the same source rather than assuming one works best on every waveform.

Bandreject: remove a wider region

Bandreject reduces a band and leaves material either side of it. Use Width to explore the size of the missing region.

This can work as an animated texture or a temporary arrangement effect. If the sound suddenly loses its identity, narrow the cut or reduce the sweep range.

Distorted combs and Scream: use feedback deliberately

The distorted comb variants combine comb behavior with pass filtering. They’re useful when a cleaner comb is close but doesn’t have enough aggression. Change the comb frequency and main cutoff separately so you can hear what each contributes.

Scream takes you toward more extreme feedback. Its secondary control affects that feedback behavior, so small moves can make a large difference.

Turn the output down before exploring extremes. Judge the note’s body as well as the scream: a spectacular isolated texture still needs a role in the track. When a setting nearly silences the patch, reduce the feedback interaction and check the routing before adding gain.

9. Explore the newer Serum 2 filters

The newer models give you more starting characters, from restrained filtering to extreme feedback. Learn them with a simple source first, then bring them into your existing patches.

Wsp: morph the response

Wsp is useful for a buzzy, characterful sweep. Its morphing behavior moves between low-pass, notch, and high-pass responses.

Try a modest envelope on Cutoff and hold Morph steady. Then switch: hold Cutoff in a useful region and move Morph. Those are two different ways to animate the same patch.

DJ Mixer: a quick sweep

DJ Mixer offers a direct high-pass/low-pass style sweep. Reach for it when you want a simple movement across a transition rather than a complicated resonant texture.

Make the sweep serve the phrase. A brief move at the end of four bars can be more effective than filtering every note.

Diffusor: change the feel of a pluck

Diffusor is especially interesting on short notes. Its phase-based processing can give an attack a rubbery, spreading quality, and the stage control lets you explore the intensity.

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The source example uses an arpeggiator and another filter as part of the patch. It demonstrates the finished combination, not an isolated Diffusor A/B. To hear its role in your own patch, bypass only Diffusor while leaving the phrase and other processing unchanged.

For a rhythm to test it on, follow our Serum 2 arpeggiator guide. Keep the notes short enough to hear how the attacks change.

MG Ladder, Acid Ladder, and EMS Ladder

These are related choices in the sense that all can shape a resonant synth part, but they give you different characters to audition. MG Ladder is a useful restrained starting point; Acid Ladder invites a more pointed, resonant phrase; EMS Ladder offers another character to explore with sustained notes or effects.

The EMS excerpt includes delay. To compare the filters themselves, disable the delay and use identical notes. Don’t infer an exact slope or a perfect hardware match just from how a model’s graph looks.

MG Dirty: explore the interaction carefully

MG Dirty goes much further into driven behavior. Treat Drive and PAIN as interacting sound-design controls and approach strong settings gradually.

Once you find a useful region, constrain modulation to that region. Mapping an entire knob range can make a playable patch disappear or become much louder midway through a phrase.

Comb 2 and the Exp filters

Comb 2 adds another resonant option, with a second frequency control to explore. It’s a good candidate when a bass or effect needs an unusually strong tonal signature.

Exp MM gives you a multimode response to sweep between, while Exp BPF focuses on a band-pass character. Compare them with the everyday shapes before adding modulation.

10. Draw and morph your own filter with PZ SVF

PZ SVF is the most open-ended part of the demonstration. You can create different filter shapes and move between them, making the transition itself part of the sound.

If it initially seems to do nothing, don’t assume it’s broken. Open the editor and inspect what’s loaded. A flat starting response won’t behave like a ready-made low-pass just because you move Cutoff.

Start with one understandable shape

1. Select PZ SVF and open its pencil editor.
2. Choose one of the four corner states.
3. Add or adjust a filter element in that state.
4. Use the element’s context menu to explore its type.
5. Listen to that corner before editing the others.

Begin with a modest bell or simple pass shape. Make a second state with a noticeably different but still useful tone. Only then add the remaining states.

Move through useful sounds

The X/Y position moves between the four states. Your goal is a playable path through them, not merely four interesting corners.

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John’s hand-drawn example becomes quite extreme. That’s a useful lesson: combinations need listening and adjustment. Test the center and the edges, and reduce excessive boosts before adding automatic movement.

Don’t assume that an all-pass element directly boosts bass on its own. Listen to the complete configuration and the way its elements interact.

Use factory shapes as a starting point

The editor’s preset menu offers a faster route into usable responses. In the demonstration, Single loads one state, while Multi changes the four-state setup.

The AEIOU multi preset gives you a clear example of vowel-like movement. It’s a useful starting point for understanding what a well-organized group of states can do.

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Once the manual sweep sounds good, add slow modulation or a macro. Limit its range to the movement you actually want, and check every note in the part. A small usable region is often more valuable than a full-range sweep.

11. Turn the lesson into three useful patches

These exercises extend the ideas in the video. The settings are starting suggestions, so adjust them to the octave, rhythm, and source you’re using.

Patch one: a pluck that opens and settles

Use one saw oscillator and Low or MG Low. Lower Cutoff until the sustained sound is dark, then add an envelope with a fast attack, short decay, and low sustain. Increase the modulation depth until the attack speaks clearly.

Play a short chord progression. If the upper notes disappear, compare key tracking on and off. Add a little resonance for definition, then compare the patch against the bypassed filter at a similar level.

Save two versions: one short and bright, one longer and softer. You now have two musical options rather than twenty unfinished filter experiments.

Patch two: a moving bass with a stable foundation

Use a detuned saw layer through Notch or a dual-notch Multi filter. Start with slow, shallow modulation. Add a separate sub only if the arrangement needs it, and check that its routing avoids the moving filter.

Play the actual bass line with the kick. Reduce the sweep if certain notes lose too much body. Check mono playback, then record a phrase so you can compare the moving version against a static one.

Patch three: a talking phrase

Start with Formant or a PZ SVF factory multi. Find two vowel positions that work on the same note, then create a restrained movement between them. Use a short MIDI phrase rather than holding one note forever.

Add a little delay only after the dry sound works. If the repeats blur the rhythm, reduce feedback or shorten the notes. Our Serum 2 Clip Sequencer guide can help you turn the sound into a repeatable pattern.

For another practical exercise, open a patch from our Serum 2 presets guide, save a copy, and identify what changes when you bypass its filters. Then recreate just that part of the patch from an initialized sound.

12. Troubleshoot the filter before adding another effect

Which Serum 2 filter should I learn first?

Start with Low or MG Low, then learn Cutoff, Resonance, an envelope, and key tracking. After that, choose one contrasting model—Notch for movement, Formant for vowels, or Diffusor for attack texture—and build a complete sound with it.

Do I need Serum 2 for every technique here?

Many basic filtering and modulation ideas also apply to Serum 1 and other synths. The newer filter models and the dual-filter interface shown here require Serum 2. Match the guide to the version you’re actually using.

Is a filter better than an EQ or an effect?

Choose by the job. A synth filter can be part of how each note develops; an EQ may be useful for balancing the resulting sound in a mix. Some Serum filter models also create effects-like textures. There’s no need to force one tool to handle every stage.

Where should I go next?

Pick one sound from this guide and put it in a track. If you work in Live, our Ableton Workflow Guide helps take an idea into an arrangement. For deeper Serum study, use the official manual alongside the Serum 2 beginner’s guide.

Source and version notes: Adapted from EDMProd’s linked Serum 2 filter demonstration. Technical checks against Xfer’s Serum 2 User Guide, “Using the Filter Modules,” completed September 10, 2026. Control labels and available models may differ across builds. The source video’s old course-launch announcement has been replaced with current course links.