Filter / Morph

How This Page Works

The Filter / Morph page is the voice design page. It decides what the filter bank is, how many filter states are active, which model each slot uses, how those slots route, how the morph engine blends them, and how the global tone controls hit the DSP. Build a useful static tone here before assigning modulators. If this page is unstable, the Matrix will only make instability move around.

Quick Understanding

If you are new to Filter8, think of this page as the place where the raw sound is chosen before any movement is added. Get the tone right here first, then use Modulators and Matrix to make it move.

Screenshots

Latest Filter / Morph Captures

These are the current Filter / Morph screenshots and menu captures used to refine the interactive replica.

Complete Control Reference

Host Parameters On This Page

Filter Catalogue

14. Full Filter Catalogue (93 Models)

Before the raw list, it helps to understand what each filter family is best at:

| Family | What makes it unique | Best use cases | Z-Plane compatible |
| --- | --- | --- | --- |
| LowPass | Removes top end while preserving lows; the most classic sweep shape. | Warming, taming brightness, synth sweeps, bass movement. | Yes |
| HighPass | Removes low end and pushes focus upward. | Cleaning mud, making motion feel lighter, opening space for kick and bass. | Yes |
| BandPass | Focuses a narrower frequency area and suppresses both extremes. | Vocal focus, movement that reads clearly in a mix, wah-like emphasis. | Yes |
| Notch | Removes a band instead of boosting it. | De-essing, hollow motion, moving phase-like tone changes without obvious peak boost. | Yes |
| Peak | Emphasizes a zone rather than cutting broadly. Includes bell and shelf-style behavior. | Presence, air, bite, broad tonal finishing. | Yes |
| Hybrid | Blends filter ideas or shifts between several response types. | Complex morphing, animated contour changes, one-model versatility. | No |
| Comb | Uses delay-based resonant spacing that creates metallic or hollow structures. | Flanging-like textures, resonant rhythmic sound design, synthetic character. | No |
| Phaser | Uses all-pass movement for sweeping cancellation patterns. | Motion texture, width movement, pads, animated midrange. | No |
| Formant | Emphasizes vowel-like spectral zones. | Vocalized movement, bass growl, synthetic speech-like tone design. | No |
| Custom | Uses your own drawn response curve. | Signature shaping, special-purpose curves, experimental responses. | No |

General guidance:

• choose LowPass and HighPass when the patch should stay mix-friendly and easy to control
• choose BandPass, Notch, and Peak when you want motion to be more obvious without necessarily using more drive
• choose Hybrid, Comb, Phaser, and Formant when character matters more than neutrality
• choose Custom when you know exactly what contour the stock models are not giving you

14.0 Why filter history matters in practice

Filters are not just technical slope shapes. Most families exist because musicians and engineers kept solving different tonal problems over decades:

• early subtractive synth work needed broad, musical low-pass and high-pass sweeps
• mixing and mastering workflows needed more precise bell, shelf, notch, and band controls
• analog instrument designers created different circuit topologies because each one distorted, resonated, and tracked differently
• later studio effects explored combing, phasing, vowel shaping, and resonator behavior for motion and special texture

That history is useful because it explains why two filters with similar cutoff positions can still feel completely different.

14.0A A fast way to choose the right family

Ask these questions:

1. Do you need broad tone control or obvious character?
2. Do you want to remove energy, emphasize energy, or create moving hollowness?
3. Should the patch stay mix-safe, or should it sound obviously synthetic?
4. Will modulation be subtle and supportive, or is the filter itself the performance effect?

Rule of thumb:

• LowPass and HighPass are the safest first choice
• BandPass, Notch, and Peak make motion easier to hear in a crowded mix
• analog character models matter when the way resonance bites is as important as the frequency move
• comb, phaser, formant, and resonator models are chosen for identity, not neutrality
• custom curves are for cases where you already know what shape the stock library is missing

14.1 Core / EQ Filters / Legacy

These are the musical bread-and-butter models. They come from the long tradition of subtractive filtering and practical tone-shaping, but they are voiced to feel immediate rather than overly clinical.

What makes this group special:

• broad, readable moves
• forgiving behavior when sweeping by ear
• easy integration into presets that need to work on many sources

Use them when:

• you are starting a patch from scratch
• you want reliable macro movement
• you need tonal shaping that still feels musical at wide settings

Examples:

• LP Smooth 2P for warm pad darkening without making the sweep too dramatic
• LP Tight 4P for stronger modern bass control
• BP Focus when you want the filter movement to read clearly on vocals or leads
• Notch Deep for animated hollowing without a huge volume jump
• Peak Soft for broad presence lifts that still feel filter-like

History note:

• these models reflect the oldest and most common filter jobs in music production: rolling off excess highs, clearing lows, focusing a band, notching a problem area, or gently emphasizing presence

• LP Smooth 2P
• LP Smooth 4P
• LP Tight 2P
• LP Tight 4P
• HP Clean 2P
• HP Clean 4P
• HP Tight 2P
• HP Tight 4P
• BP Wide
• BP Narrow
• BP Dual
• BP Focus
• Notch Wide
• Notch Narrow
• Notch Dual
• Notch Deep
• Peak Soft
• Peak Sharp
• Shelf Low
• Shelf High
• Hybrid Tilt
• Hybrid Hollow
• Hybrid Punch
• Hybrid Air

14.2 Core / EQ Filters / Modern

This family is more explicit and technical. Instead of broad voiced labels only, it includes classic slope descriptions such as 6 dB, 12 dB, 24 dB, and steeper utility responses.

Why this matters:

• slope tells you how aggressively the filter removes material past the cutoff
• gentler slopes sound more natural and open
• steeper slopes sound more controlled, obvious, and utility-focused

Quick slope guide:

• 6 dB: subtle, airy, easiest to hide in a mix
• 12 dB: classic all-purpose balance between tone and control
• 18 dB: slightly firmer and more characterful
• 24 dB: strong classic synth-style authority
• 36 dB and 48 dB: increasingly strict cutoff for modern cleanup or dramatic effect

Key differences inside this family:

• Brickwall LP and Brickwall HP are for the strictest frequency containment, not for the most natural sweep feel
• All-pass changes phase more than tone balance, which is why it becomes useful in phasing-style movement or alignment experiments
• Tilt EQ is excellent when you want one move to brighten one side while darkening the other

Example uses:

• HP 12 dB to clean guitar or synth mud without making the source feel thin
• LP 24 dB for unmistakable electronic sweeps
• Peaking-Bell for moving presence or nasal emphasis
• Tilt EQ for macro-controlled brighter/darker transitions
• Brickwall HP when you need to keep subs out aggressively

History note:

• this group reflects the move from broad analog voicing toward more explicit engineering-style filter definitions, where slope and precision became part of the creative vocabulary

• LP 6 dB
• LP 12 dB
• LP 18 dB
• LP 24 dB
• LP 36 dB
• LP 48 dB
• HP 6 dB
• HP 12 dB
• HP 18 dB
• HP 24 dB
• HP 36 dB
• HP 48 dB
• Band-pass
• Notch (Narrow)
• Band-stop (Wide)
• All-pass
• Peaking-Bell
• Low Shelf
• High Shelf
• Tilt EQ
• Brickwall LP
• Brickwall HP

14.3 Analog / Character Models

This group is where circuit history really matters. These models are not only about what frequencies get removed; they are about how the underlying topology resonates, saturates, and feels under motion.

Key historical families in this section:

• State-variable designs became famous for flexible multimode behavior and smooth, elegant sweeps
• Ladder designs became iconic because resonance and drive interact in a very musical, speaking way
• Diode ladder variants often feel sharper, more pointed, and more aggressive than transistor ladders
• SEM-style responses are prized for openness and a less claustrophobic quality
• Sallen-Key approaches often feel smooth, polished, and hi-fi
• MS-20-style pairings are loved for rawness, edge, and unruly bite

How to choose between them:

• choose SVF LP-BP-HP Morph when you want one model that can travel across several classic responses
• choose Transistor Ladder for classic synth authority and rounded but powerful resonance
• choose Diode Ladder when you want the sweep to speak more sharply
• choose SEM-style when you want width and openness more than aggression
• choose Sallen-Key style when you want refined tonal contour
• choose MS-20 HP-LP Pair when grit and edge are the point

Example uses:

• ladder models for bass and mono-synth style movement
• SEM-style for airy pads and broad motion
• MS-20 HP-LP Pair for acidic leads, drums, and aggressive transitions

• SVF LP-BP-HP Morph
• Transistor Ladder
• Diode Ladder
• SEM-style
• Sallen-Key style
• MS-20 HP-LP Pair

14.4 Creative / Modulation Filters

These models come from effect design as much as from plain tone control. They are for sounds where the filter is meant to be heard as an effect, not hidden as corrective shaping.

Historical background:

• Comb filters come from delay-line interference and are closely related to flanging and resonant metallic coloration
• Phaser-style movement comes from cascading all-pass stages to create moving cancellation notches
• Formant responses imitate the spectral emphasis patterns of vowel sounds
• Auto-wah style designs come from envelope-controlled pedal and funk effects
• Resonator banks echo the idea of tuned resonant bodies rather than ordinary EQ

What makes them unique:

• they imprint identity very quickly
• even small modulation amounts can sound obvious
• they are often better for hooks, transitions, and signatures than for subtle cleanup

Examples:

• Comb (Feedback) for metallic bass growl or sci-fi transitions
• Formant-Vowel for talking synths and vocalized movement
• Twin-peak Dual-peak for animated nasal midrange
• Auto-wah Envelope BP for touch-reactive funk or rhythmic articulation

• Comb (Feedforward)
• Comb (Feedback)
• Formant-Vowel
• All-pass Chain
• LP-BP-HP Morph
• Twin-peak Dual-peak
• Resonator Bank
• Auto-wah Envelope BP

14.5 Dynamic / Utility Filters

This section is about context-aware filtering rather than one fixed tone shape.

What makes it different:

• the response can react to the signal or sidechain
• the signal can be divided into bands or stereo domains
• phase behavior itself becomes part of the choice

Differences and use cases:

• Dynamic Filter is useful when the tone should open or close in response to input level
• Sidechain-reactive Filter is for making one source move out of the way of another
• M-S Filter Mode lets you treat the center and sides differently, which is useful for widening highs while protecting mono low-end
• Multiband modes are for applying different filter behavior to different ranges at once
• Linear-phase Mode is best when phase shift must stay controlled, often in corrective or mastering-leaning work
• Minimum-phase Mode is better when you want the more traditional, more characterful phase behavior of standard filtering

Examples:

• use M-S Filter Mode to brighten stereo edges while keeping the center stable
• use Multiband 3-band to darken harsh highs without muddying the mids
• use Sidechain-reactive Filter for vocal space that sounds spectral rather than just compressed

• Dynamic Filter
• Sidechain-reactive Filter
• M-S Filter Mode
• Multiband 2-band
• Multiband 3-band
• Multiband 4-band
• Linear-phase Mode
• Minimum-phase Mode

14.6 Content-Focused Macros

These are purpose-built voicings aimed at common production goals rather than abstract filter theory.

Why they are useful:

• they shorten decision-making
• they translate the question from "which topology do I need?" to "what result do I need?"
• they are ideal when you care more about outcome than circuit identity

Examples:

• Vocal Focus for bringing a voice forward without reaching for a generic brightening move
• Vocal De-ess Notch for softening sibilant energy more selectively
• Bass Tight for controlling boom while keeping impact
• Pad Wash for pushing a source into a softer, more diffused supporting role
• Lead Bite when a line needs to cut through dense arrangement layers

• Vocal Focus
• Vocal Air
• Vocal De-ess Notch
• Bass Tight
• Bass Sub-Clean
• Bass Growl
• Lead Presence
• Lead Bite
• Pad Warm
• Pad Wash
• Pad Air
• Pad Motion

14.7 Creative / Legacy Extras

This final group expands the more stylized legacy effects with extra variants. Think of them as alternate colors inside the creative families rather than neutral starting points.

How to hear the differences:

• short comb variants feel tighter and more pitched
• long comb variants feel roomier, more metallic, or more hollow
• phaser depth and width variants change how broad the moving cancellations feel
• formant variants shift the vowel identity and therefore the apparent mouth shape of the sound

Best use cases:

• short combs for plucks, percussion, and bass texture
• long combs for transitions, drones, and metallic tails
• deeper phasers for pads and wide synths
• alternate formants for talking-bass movement or synthetic vocal chops

• Comb FF Short
• Comb FF Long
• Comb FB Short
• Comb FB Long
• Phaser 4
• Phaser 6
• Phaser Deep
• Phaser Wide
• Formant 1
• Formant 2
• Formant 3
• Formant 4

14.8 Custom

• Custom Drawn

15. Factory Preset Variant Summary

The source tree currently defines 34 factory presets:

• 16 Retro-oriented 2-filter presets
• 10 XY 4-filter presets
• 8 XYZ 8-filter presets

That preset structure mirrors the plugin's three main morph design styles:

• focused 2-filter motion
• planar XY motion
• full cube XYZ motion