What it does
Fusion Filter puts five carefully chosen, genuinely different filter architectures behind the same AMOUNT, RESONANCE and MIX controls: Diode Ladder, Transistor Ladder, Digital Multimode, State-Variable and Dual OTA / Sallen-Key. Selecting a new engine changes the underlying filter architecture itself, not just a slope or EQ curve, and the switch is crossfaded so engines change over without a click or a dropout.
Each keeps its own character: ACCENT lets input transients push the Diode Ladder's cutoff/resonance response, the Transistor Ladder pushes into saturated feedback and extended oscillation, the Digital Multimode switches cleanly between LP/BP/HP, the State-Variable's MORPH sweeps continuously from LP through notch to HP, and the Dual OTA / Sallen-Key adds oscillation with HARD/SOFT circuit character. A synced or free-running LFO turns any of them into movement, bounded by LOW/HIGH.
What it does
Fusion Filter puts five carefully chosen, genuinely different filter architectures behind the same AMOUNT, RESONANCE and MIX controls: Diode Ladder, Transistor Ladder, Digital Multimode, State-Variable and Dual OTA / Sallen-Key. Selecting a new engine changes the underlying filter architecture itself, not just a slope or EQ curve, and the switch is crossfaded so engines change over without a click or a dropout.
Each keeps its own character: ACCENT lets input transients push the Diode Ladder's cutoff/resonance response, the Transistor Ladder pushes into saturated feedback and extended oscillation, the Digital Multimode switches cleanly between LP/BP/HP, the State-Variable's MORPH sweeps continuously from LP through notch to HP, and the Dual OTA / Sallen-Key adds oscillation with HARD/SOFT circuit character. A synced or free-running LFO turns any of them into movement, bounded by LOW/HIGH.
In Action
Highlights
- Five distinct filter architectures behind one interface: Diode Ladder, Transistor Ladder, Digital Multimode, State-Variable and Dual OTA / Sallen-Key
- Click-free switching between filter engines
- Dual OTA / Sallen-Key engine adds HARD/SOFT circuit character
- EXTEND relaxes the resonance ceiling on the Transistor Ladder and Dual OTA / Sallen-Key engines for harder, more extreme self-oscillation
- Built-in LFO modulation of AMOUNT/cutoff
- LFO movement is additive around the live knob position rather than overriding it
- LOW/HIGH range controls bound modulation inside a defensive safety corridor
- FULL SWEEP mode spans the entire cutoff range with automatic loudness compensation, so a full filter sweep holds its level
- Host-synced modulation using grid divisions and deterministic playhead timing
- Free-running modulation mode using accumulated phase
- EXPORT MODE - 4x oversampling for higher-quality final renders
Requirements
- Formats
- VST3 · AU
- Windows
- Windows 64-bit (VST3)
- macOS
- VST3 and AU (Logic Pro)
- Licensing
- Offline ZERO9 licence file - no machine binding or mandatory online activation.
- Demo
- Free to download. Runs in demo mode until you add a licence.
VST3 · Windows 64-bit · macOS · AU (macOS · Logic Pro)
FAQ
- Can I try it before buying?
- Yes. Free to download. Runs in demo mode until you add a licence.
- How do I receive my licence?
- Your licence is emailed automatically after purchase, typically within a minute or two.
- Do I need to be online to activate?
- No. It uses an offline ZERO9 licence file - no machine binding or mandatory online activation.
- What is Export Mode?
- EXPORT MODE - 4x oversampling for higher-quality final renders
- Is there a bundle?
- Yes. The Complete Suite includes all eight paid ZERO9 plugins for £100, saving £40 against buying them individually.