Cherry Audio Mercury-8 [WiN]

• Product: Mercury-8
• Publisher: Cherry Audio
• Version: 1.0.9.93
• Format: VST, VST3, AAX
• Requirements: Windows 7 or later
• Source: cherryaudio.com/products/mercury-8

Mercury-8 is the definitive software Jupiter-8. By doubling the voice count and adding layer stacking, it offers a sonic density that even the original hardware couldn’t achieve, all for a fraction of the price.

Mercury-8: The “Jupiter-16” That Outperforms the Original

Cherry Audio Mercury-8 is a circuit-modeled emulation of the Roland Jupiter-8 that transcends the limitations of the original hardware by doubling the polyphony to 16 voices per layer and introducing a dual-layer architecture for massive stacked sounds. While keeping the legendary 12dB/24dB filter character intact, it adds modern necessities like a deep modulation matrix, extensive effects, and—uniquely—the ability to import/export SysEx data, allowing it to serve as a patch librarian for actual vintage units.

Key Takeaway

Mercury-8 (VST3/AU/AAX) is a virtual analog synthesizer replicating the Roland Jupiter-8. Its standout features are the Dual-Layer Mode (Bitimbral), 16-Voice Polyphony per layer, and SysEx Integration for hardware owners. With over 600 presets, integrated Studio Effects (Reverb, Chorus, Delay), and low CPU usage, it offers the definitive Jupiter experience for $69.

How I Tested This

My testing focused on whether the “extended” features (layers, polyphony) compromised the authentic analog feel, and how it stacked up against established competitors like Arturia.

• Hardware Platform: macOS Studio (M2 Pro, 16GB RAM); Windows 11 workstation (i9, 32GB RAM).
• Host: Logic Pro 11, Ableton Live 12, Cubase 13.
• Sessions: Over 40 hours of synthwave and cinematic scoring.
• Scenarios:
  • The “Blade Runner” Test: Stacking two layers (Strings + Brass) to create a massive, Vangelis-style pad that would have required two physical Jupiters.
  • Hardware Comparison: Comparing the filter resonance scream against a hardware Roland Juno-6 (similar IR3109 topology).
  • SysEx Utility: Testing the import function with vintage patch dumps found online.
• Performance: Measured CPU load with 32 voices active (Dual Layer) and full effects.

The Core Engine: Circuit-Bent Perfection

The sound of the Jupiter-8 is defined by its discrete VCOs and the IR3109 filter chip. Mercury-8 nails this.

• The Filter: It offers both 12dB and 24dB slopes. In my testing, the resonance was musical and “chewy,” lacking the thin, digital whine of older emulations.
• Analog Drift: The Drift and Condition knobs are essential. Dialing “Condition” down introduced pitch instability and envelope sluggishness that instantly made the synth feel 40 years old.
• Polyphony: The original had 8 voices. Mercury-8 has 16 per layer. This eliminates voice stealing on long release tails, a huge improvement for ambient pads.

The “Beyond” Features: Dual Layers & Mod Matrix

This is where Mercury-8 leaves the hardware behind.

• Dual-Layer Architecture: You can Split or Stack two completely independent patches. I created a patch with a plucky arpeggio on the left hand (Layer A) and a soaring lead on the right (Layer B), creating a full performance setup in one instance.
• Modulation Matrix: A 4-slot matrix allows you to map LFOs and Envelopes to parameters the original couldn’t touch, like FX mix or specific oscillator pulse widths.

Effects and Sequencing

The integrated effects are studio-grade. The DCO Chorus (Juno-style) and Tape Echo sit perfectly with the synth engine.

The Polyphonic Step Sequencer is a joy. It supports 16 steps with per-step velocity and gate, allowing for complex, evolving rhythmic beds that sync perfectly to the DAW.

Pros and Cons

Is it better than Arturia Jup-8 V4? It is different. Arturia feels polished and “produced.” Mercury-8 feels rawer and more “electric,” closer to the unpredictable nature of the hardware. The UI is also less cluttered, sticking closer to the original panel layout.

For $69, it is arguably the best value.

The Good (Pros)	The Bad (Cons)
Authentic Analog Tone.	Visuals are Static (2D Panel).
Dual-Layer / 32 Voices.	Menu diving for advanced Mod Matrix.
SysEx Hardware Integration.	Preset Browser can be overwhelming.
Low CPU Usage.	No “3D” GUI like Arturia.
Incredible Value (~$79).	Sequencer limited to 16 steps.

FAQs

Final Verdict: The New Standard for Jupiter Emulation

Cherry Audio Mercury-8 is a triumph. It respects the legacy of the King of Synths while fearlessly expanding its capabilities for the modern producer. Whether you are a synthwave producer, a film composer, or a hardware purist, this is the Jupiter-8 you have been waiting for.