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Mastering the PolyKB Spatializer and 3D Modulation Matrix The XILS-lab PolyKB III is famous for its ultra-creamy, Roland RS-505 and Polykobol-inspired analog emulation. However, its true superpower lies in its spatializer and 3D modulation matrix. These tools let you move beyond standard stereo panning to create moving, immersive acoustic spaces directly within the synth engine.

Here is how to master these advanced features to bring your sound design into the third dimension. Understanding the PolyKB Spatial Framework

The PolyKB does not just pan sounds left and right. It treats the stereo field as a physical space where each synthesizer voice can have its own coordinate.

Voice Dispersion: Spreads individual polyphonic voices across the stereo field automatically.

Dynamic Positioning: Moves the acoustic center of your sound based on synthesis parameters.

Space Models: Offers different algorithms to simulate how sound waves interact with human hearing. Step 1: Setting Up the Spatializer Section

Before diving into heavy modulation, you must configure the core spatializer module located on the right side of the interface.

Select the Mode: Choose between standard stereo, wide stereo, or the custom 3D acoustic space models.

Adjust the Width: Use the Space/Width knob to define the boundaries of your sonic field.

Set the Source Dispersion: Turn up the Voice Dispersion knob. Play a chord; you will hear each note strike a slightly different physical location between your speakers. Step 2: Demystifying the 3D Modulation Matrix

Standard modulation matrices offer a simple “Source to Destination” path. The PolyKB 3D matrix introduces a spatial layout where sources can modulate the X (horizontal), Y (vertical/depth), and Z (timbral/altitude) coordinates of the sound. X-Axis (Width): Controls left-to-right movement.

Y-Axis (Depth): Controls front-to-back perceived distance, often linked to subtle volume and filter attenuation.

Z-Axis (Morphing): Controls complex structural changes, like morphing between oscillator waveforms as the sound moves. Step 3: Creating Immersive Patch Movements

To get the most out of the 3D matrix, you need to assign dynamic sources to your spatial targets. Try these three classic setups: The Polyphonic Orbit

Source: LFO 1 (Sine wave) and LFO 2 (Triangle wave set to a slightly different speed).

Destination: Route LFO 1 to the X-axis and LFO 2 to the Y-axis.

Result: The sound will smoothly circle around the listener’s head rather than just bouncing left and right. The Velocity Distance Effect Source: Keyboard Velocity. Destination: Y-Axis (Depth) and VCF Cutoff.

Result: Playing softly pushes the sound into the background with a darker tone. Striking the keys harder pulls the sound sharply to the front of the mix. The Organic Key-Tracking Spread Source: Key Tracking (Key Follow). Destination: X-Axis.

Result: Low notes anchor themselves to the left or center, while higher notes automatically fan out to the far right, mimicking the physical layout of a grand piano. Advanced Tips for Clean Mixing

Multi-dimensional modulation can quickly overwhelm a mix if left unchecked. Use these professional guidelines to keep your tracks clean:

Keep the Low End Mono: If your patch has a heavy sub-bass component, use the built-in high-pass sidechain filter or external processing to keep frequencies below 120Hz locked to the center.

Match LFOs to Track Tempo: Sync your spatial LFOs to the host BPM. Random, un-synced panning can cause mixing artifacts and listener fatigue.

Use Visualizers: Insert a vector scope or goniometer plug-in after the PolyKB on your master chain. This helps verify that your 3D modulations are not causing phase cancellation issues.

To continue refining your synthesizer workflow, let me know what you would like to explore next. I can provide step-by-step instructions on syncing the spatializer to your DAW tempo, show you how to morph oscillator shapes using the Z-axis, or troubleshoot stereo phase cancellation issues in your mix.