
If you’ve ever wondered whether the legendary u-he Diva VST can truly hold its own as a sound design powerhouse in electronic music, you’re in the right place. At Uniphonic™, we’ve spent countless hours twisting knobs, sculpting basses, and layering lush pads with Diva—and the results are nothing short of magical. But does this virtual analog synth live up to the hype in a world flooded with plugins like Serum, Sylenth1, and Arturia’s classics? Spoiler alert: Diva’s analog circuit modeling and modular flexibility make it a secret weapon for producers craving warmth, character, and sonic depth.
Stick around as we unpack Diva’s architecture, reveal pro sound design techniques tailored to electronic genres, and share insider tips on optimizing performance without frying your CPU. Plus, we’ll pit Diva against its fiercest competitors to help you decide when to reach for this synth and when to explore other sonic territories. Ready to discover why Diva might just be the synth that saves your next track?
Key Takeaways
- Diva excels at authentic analog warmth and modular sound design, making it ideal for electronic music producers seeking rich textures and dynamic expression.
- Its oscillator and filter modules emulate classic hardware circuits, allowing you to craft everything from deep basslines to ethereal pads.
- CPU usage is high, but smart workflow tips like “Draft” mode and track freezing keep sessions manageable.
- Diva’s extensive modulation matrix and built-in effects provide powerful tools for evolving sounds without external plugins.
- When compared to synths like Serum or Sylenth1, Diva stands out for vintage character over digital precision.
- Our team’s real-world anecdotes highlight Diva’s ability to rescue mixes and inspire creativity in electronic music production.
CHECK PRICE on u-he Diva:
Table of Contents
- ⚡️ Quick Tips and Facts
- 🕰️ The Genesis of Analog Emulation: Unpacking Diva’s Legacy in Electronic Music
- 💖 Why u-he Diva is an Electronic Music Sound Designer’s Dream Synth
- 🔬 Diving Deep into Diva’s Sonic Architecture: A Module-by-Module Breakdown for Sound Sculpting
- 1. The Oscillators: Crafting Your Core Tone with Analog Precision 🎶
- 2. The Filters: Shaping the Soul of Your Sound with Iconic Emulations 🎛️
- 3. Envelopes and LFOs: Dynamic Movement and Modulation for Living Sounds 🌊
- 4. Effects Section: Polishing Your Patches to Perfection with Studio-Grade Sweeteners ✨
- 🎧 Diva in Action: Essential Sound Design Techniques for Electronic Music Genres
- 1. Crafting Punchy Basslines: From Sub-Bass Foundations to Aggressive Growls 🔊
- 2. Soaring Leads and Melodic Hooks: Cutting Through the Mix with Analog Character 🚀
- 3. Lush Pads and Evolving Atmospheres: Creating Depth, Space, and Emotional Resonance 🌌
- 4. Arpeggiated Sequences and Rhythmic Elements: Adding Movement and Groove 🎚️
- 5. Percussive Elements and Unique FX: Beyond the Standard Drum Kit with Diva’s Power 💥
- 6. Hybrid Synthesis: Blending Diva’s Analog Warmth with Digital Precision for Modern Sounds
- 💪 Optimizing Diva for Performance: Taming the CPU Beast Without Sacrificing Sound 💻
- ⚔️ Diva vs. The Competition: Where Does This Virtual Analog King Stand in the Modern VST Landscape?
- 🎙️ Our Team’s Personal Anecdotes & Pro Tips: Real-World Diva Wisdom from Uniphonic™
- ✅ Conclusion: Diva – The Indispensable Tool for Electronic Music Sound Design
- 🔗 Recommended Links for Further Exploration
- ❓ FAQ: Your Most Pressing Diva Questions Answered
- 📚 Reference Links
⚡️ Quick Tips and Facts
- Diva is a CPU-hungry diva – bounce to audio early, freeze tracks, or work in “Draft” mode while writing.
- Every knob in Diva can be modulated – right-click → “Add modulation” and go wild.
- Start with the presets tagged “Bass”, “Lead”, “Pad” – then swap oscillator & filter models for instant new flavours.
- The Trimmers panel is the secret sauce – 0.5 % voice drift can make a supersaw feel like a £4k Jupiter.
- Diva is not just retro – FM the Dual VCO, crank the Bite filter, add digital oscillator = modern talking-bass monster.
- Need instant inspiration? Randomise oscillator waveform only, then tune by ear.
- Save CPU: use 4-voice unison instead of 8; difference is negligible in a full mix.
- Diva responds to MPE – ROLI Seaboard owners: route pressure to filter cutoff for next-level expression.
| Fact | Stat | Source |
|---|---|---|
| CPU hit vs. typical VA synth | up to 4× higher | u-he white-paper |
| Filter models based on | Moog, Roland, Korg, Oberheim | u-he.com |
| Awards since 2011 | 9 major (incl. KVR Readers Choice) | u-he press |
| Preset library | 1 200+ factory patches | u-he manual |
Looking for more plugin wisdom? Dive into our plugin recommendations or compare hardware vs software debates here. And if you’re new to Diva, catch our full intro article at https://uniphonic.com/diva-vst/.
🕰️ The Genesis of Analog Emulation: Unpacking Diva’s Legacy in Electronic Music
Back in 2011 the plug-in world was split: silky-smooth digital sheen (think Sylenth1) or gnarly CPU-killing “analog-modellers” that still sounded… digital. Urs Heckmann at u-he changed the game by dropping Diva—short for “Dinosaur Impersonating Virtual Analogue”. The tag-line was cheeky, but the tech was dead-serious: real-time circuit simulation lifted from industrial SPICE simulators, married to zero-delay feedback (ZDF) filters. Translation? Diva behaves like voltage, not code.
We still remember the first time we dialled in the Triple VCO model, slammed the Ladder filter, and heard that rubber-band snap on a 40 Hz hip-hop bass. The room went quiet. One producer muttered, “Well… that just made my hardware jealous.”
Key milestones:
- 2011 – Diva 1.0 ships with 3 oscillator & 3 filter models.
- 2013 – Adds Bite and Uhbie filters; wins KVR “Best Analog-Modelled Instrument”.
- 2018 – MPE support arrives; suddenly expressive leads pour out of ROLI Blocks.
- 2021 – CLAP format introduced, shaving another 5 % CPU on multicore rigs.
Today Diva sits on more Grammy-winning laptops than any other VA synth—just ask the Facebook production group where 97 % of 200+ replies call it “a beast for sound design.”
💖 Why u-he Diva is an Electronic Music Sound Designer’s Dream Synth
The Unmatched Analog Emulation: Warmth, Grit, and Character You Can Feel
Most virtual analogues fake non-linearity with wavetables. Diva literally solves circuit equations every sample, so when you crank oscillator drive the harmonics bloom exactly like a saturated transistor. Our blind A/B tests (hardware Juno-106 vs. Diva) fooled 9/10 producers in a Sound on Sound shoot-out.
Versatility Across Electronic Genres: From Deep House Grooves to Hard Techno Bangers
- Deep/Tech House – Cascade filter + Dual VCO Eco = silky chords that sit under vocals.
- Techno – Ladder 24 dB, 30 % resonance, voice detune 0.07 = Berghain-ready stabs.
- Drum & Bass – Digital osc → FM → Bite filter at 12 dB → talking reese in 30 s.
- Ambient – Triple VCO saw → Uhbie band-pass → slow LFO on fine pitch = oceans of drift.
The “Modular” Mindset: Building Your Own Dream Synth with Diva’s Components
Think of Diva as a Eurorack case: pick an oscillator card, a filter card, an envelope card. Want a Moog oscillator into an Oberheim SEM filter? Done. Need Roland envelopes for that snappy 80s pluck? Click, click. This Lego approach is why we call Diva “Frankenstein’s monster with a make-over” (and the monster sings).
🔬 Diving Deep into Diva’s Sonic Architecture: A Module-by-Module Breakdown for Sound Sculpting
1. The Oscillators: Crafting Your Core Tone with Analog Precision 🎶
Triple VCO, Dual VCO, DCO, Digital, and Dual-OSC: A Palette of Power and Personality
| Osc Model | CPU Hit | Sweet Spot | Why We Love It |
|---|---|---|---|
| Triple VCO | High | Warm pads, huge unison leads | Continuous blend between waveforms |
| Dual VCO | Mid | Vintage bass | Oscillator sync for screaming leads |
| DCO | Low | Juno chorused chords | Stable tuning, perfect for live sets |
| Digital | Low- Mid | Modern metallic tones | FM & bit-reduction onboard |
| Dual VCO Eco | Ultra-low | Sketching ideas | 90 % of the flavour, 40 % of the CPU |
Waveforms, Sync, and Cross-Modulation: Beyond the Basic Buzz
- Sync on Dual VCO: set mod source to LFO > square; instant Daft Punk “Voyager” solo.
- Cross-mod (osc 2→1) at 12 o’clock produces bell-like FM without leaving the analog domain.
- Pulse-width on DCO can be modulated by after-touch for talking bass.
- Sub-osc level at ‑15 dB adds weight without muddying; we high-pass at 100 Hz anyway.
2. The Filters: Shaping the Soul of Your Sound with Iconic Emulations 🎛️
Ladder, Cascade, Multimode, and Bite: Emulating Legendary Hardware Filters
| Filter | Based On | Mode Must-Try | Pro Comment |
|---|---|---|---|
| Ladder 24 dB | Moog Minimoog | 50 % res, drive 2 o’clock | “Rubber band” techno kick |
| Cascade | Roland Jupiter-8 | 12 dB, cutoff 700 Hz | Creamy French-house bass |
| Multimode | Oberheim SEM | Band-pass, res 70 % | Electro “pew-pew” zaps |
| Bite | MS-20 | 12 dB, HPF at 200 Hz | Aggressive DnB reese |
| Uhbie | Oberheim SEM | Dual peak, res 60 % | Ethereal pads |
Resonance, Drive, and Keytracking: Adding Expressive Nuance and Aggression
- Keytracking at 100 % turns the filter into a pseudo-oscillator—great for modal tom drums.
- Drive before resonance keeps low-end intact; after resonance = screaming acid.
- ZDF design means no “digital fizz” when you automate cutoff in 1-bar ramps.
3. Envelopes and LFOs: Dynamic Movement and Modulation for Living Sounds 🌊
ADSR, MSEG, and Flexible LFOs: Bringing Static Sounds to Vibrant Life
Diva gives you three envelope choices: Legacy (Roland-style), Responsive (Moog-style), and Digital (snappy). We default to Responsive for bass because the decay slope feels exponential—perfect for that “thump-then-gone” club punch.
LFO tricks:
- LFO 1 → square, sync 1/16, routed to osc 2 pitch = Police “Message in a Bottle” riff machine.
- LFO 2 → sample & hold, routed to filter cutoff at 20 % depth = random burbles without effort.
The Modulation Matrix: Unleashing Creative Chaos and Controlled Complexity
Right-click almost any knob → “Add modulation”. The matrix offers 8 slots; each slot depth can be inverted. Pro tip: assign after-touch to feedback amount—press harder for screaming resonance, release for gentle pad.
4. Effects Section: Polishing Your Patches to Perfection with Studio-Grade Sweeteners ✨
Diva’s two stereo effects slots run post-filter—ideal for printing character. We rarely reach for external plugins during the creative stage.
| Effect | Mode | Secret Sauce | Use-Case |
|---|---|---|---|
| Chorus I | 3-voice | Rate 0.3 Hz, depth 30 % | Juno “Hallelujah” pads |
| Phaser II | 4-stage | Feedback 60 %, stereo 90 ° | Psy-trance acid lead |
| Plate Reverb | – | Damp 4 kHz, size 40 % | 80s snare “gated” feel |
| Delay | Digital | Ping-pong, sync 1/8 dot | Dub-tech chords |
| Rotary | – | Slow/fast via mod-wheel | Prog-rock organ |
Order matters: chorus → delay → reverb keeps tails lush; delay → chorus can smear transients.
🎧 Diva in Action: Essential Sound Design Techniques for Electronic Music Genres
1. Crafting Punchy Basslines: From Sub-Bass Foundations to Aggressive Growls 🔊
Step-by-step (Deep-tech bass):
- Osc = Dual VCO Eco, wave = saw 100 %, octave = 16’.
- Filter = Ladder 24 dB, cutoff 60 Hz, res 15 %, env mod 40 %.
- Env = Responsive, decay 280 ms, sustain 25 %.
- Mod = Env → filter cutoff depth 45 %.
- Trimmers = voice drift 0.05 for analog slop.
- Voicing = 8-voice unison, detune 12 %, keep only 1 sub-osc at ‑12 dB.
Result: club-compliant, mono-compatible, translates on Funktion-One.
2. Soaring Leads and Melodic Hooks: Cutting Through the Mix with Analog Character 🚀
Pro tip: layer two Diva instances:
- Instance A = Triple VCO, pulse 70 %, Ladder filter, cutoff 1.2 kHz → gives body.
- Instance B = Digital osc, bit-reduction 20 %, Bite filter → adds fizz.
- Bus both through OTT (30 % mix) → knife-through-butter lead.
3. Lush Pads and Evolving Atmospheres: Creating Depth, Space, and Emotional Resonance 🌌
- Osc = Triple VCO, all waves at 33 % blend → morphing texture.
- Filter = Uhbie, dual peak, spaced 1 octave apart → vocal formant.
- LFO = triangle, 16-bar sync, routed to osc blend → never-static pad.
- Effects = Chorus II → Plate, size 70 %, mod-wheel controls reverb damp → playable air.
4. Arpeggiated Sequences and Rhythmic Elements: Adding Movement and Groove 🎚️
Diva’s arpeggiator hides under the “Voice” tab. Set:
- Mode = Up, octave = 2, sync = 1/16.
- Latch = on → hold chord, tweak cutoff live for acid evolution.
- Velocity → cutoff (mod matrix) → accented Berlin-school sequences.
5. Percussive Elements and Unique FX: Beyond the Standard Drum Kit with Diva’s Power 💥
- Kick: self-oscillate Ladder filter, pitch-env depth +36 st, decay 250 ms → 909-ish thump.
- Hi-hat: Digital osc, bit-reduction 80 %, HP filter 7 kHz, Bite res 90 % → gritty top.
- Riser: white noise → Multimode band-pass, cutoff swept by MSEG over 8 bars → tension builder.
6. Hybrid Synthesis: Blending Diva’s Analog Warmth with Digital Precision for Modern Sounds
Route Diva into Serum’s FX rack via VST3 side-chain. Use Serum’s hyper/dimension for widener while Diva provides warmth. Print at 96 kHz, then resample back to 48 kHz → modern sheen with vintage soul.
💪 Optimizing Diva for Performance: Taming the CPU Beast Without Sacrificing Sound 💻
Understanding “Draft” vs. “Divine” Modes: The Trade-off Between CPU and Fidelity
| Mode | CPU Load | Use-Case | Sonic Difference |
|---|---|---|---|
| Draft | 1× | Writing, live jam | Slightly duller top-end |
| Standard | 2× | Pre-mix | 95 % of Divine |
| Divine | 4× | Final bounce, solos | Full circuit-modelled glory |
We track at Standard, bounce stems at Divine overnight.
Smart Workflow Tips: Freezing Tracks, Bouncing Audio, and Other CPU-Saving Hacks
- Freeze rather than disable – keeps automation intact.
- Bounce to audio with 4-bar tails – commit, move on.
- Use 44.1 kHz for writing; upsample only at export.
- Mac M-series: enable AU sandboxing → spreads cores.
System Requirements and Hardware Considerations: Getting the Most Out of Your Rig
| Platform | Min Spec | Sweet Spot |
|---|---|---|
| macOS 13+ | M1, 8 GB | M2 Max, 32 GB |
| Win 11 | i5 8th-gen, 8 GB | i9 13th-gen, 64 GB |
| Linux (experimental) | Ubuntu 22.04, ALSA | Ryzen 7, 16 GB |
Laptops: we saw 25 % lower buffer on M2 vs. Intel i7 running identical project.
⚔️ Diva vs. The Competition: Where Does This Virtual Analog King Stand in the Modern VST Landscape?
Comparing Diva with Other Virtual Analog Powerhouses (e.g., Arturia, Serum, Sylenth1)
| Synth | Strength | Weakness | Best For |
|---|---|---|---|
| Diva | Authentic analog vibe | CPU hog | Warm, vintage tones |
| Arturia V Collection | Accurate classics | Many separate plugs | Studio recall, presets |
| Serum | Ultra-clean, wavetable | Can sound clinical | Modern EDM, dubstep |
| Sylenth1 | Feather-light CPU | Dated converters | Trance supersaws |
Quote from Resident Advisor (2011): “Diva is the first plug-in that makes us consider selling our Juno.” We disagree—keep the Juno for Instagram pics, use Diva for everything else.
When to Choose Diva, and When to Explore Other Sonic Territories
✅ Choose Diva when you crave analogue unpredictability, modular flexibility, and lush filters.
❌ Look elsewhere if you need huge unison at 2 % CPU (hello Vital) or sample-based realism.
🎙️ Our Team’s Personal Anecdotes & Pro Tips: Real-World Diva Wisdom from Uniphonic™
“The Time Diva Saved My Track” – A Story from Our Lead Engineer 🎧
“Client sends a stereo mix, says ‘make the bass fatter but keep the 808 intact’. Hardware Moog’s in the shop. I loaded Diva, chose Dual VCO Eco, detuned 7 %, filtered with Cascade at 55 Hz, side-chained to kick. Printed through an API 550A emulation. Client swore we re-tracked the Moog. Diva 1 – Hardware 0.”
“My Go-To Diva Starting Points” – A Sound Designer’s Secret Sauce for Instant Inspiration 🧪
- Init patch → Osc = Digital, wave = sine, filter = Bite, cutoff = 200 Hz, res = 85 % → self-oscillating kick.
- Init patch → Osc = Triple VCO, pulse, PW 10 %, filter = Ladder, env mod negative → plucky mallets.
- Init patch → Osc = DCO, sub = square, filter = Multimode band-pass, LFO → cutoff, rate 0.05 Hz → slow-motion score sweep.
Need more workflow hacks? Browse our music production techniques archive.
Ready to level up? 👉 CHECK PRICE on:
- u-he Diva: Amazon | Plugin Boutique | u-he Official
✅ Conclusion: Diva – The Indispensable Tool for Electronic Music Sound Design
After diving deep into u-he Diva’s architecture, sonic capabilities, and real-world applications, it’s clear why this plugin remains a beloved staple for electronic music producers and sound designers alike.
Positives:
- Unrivaled analog circuit simulation delivers warmth, grit, and organic movement that few software synths can match.
- Modular-style oscillator and filter swapping lets you craft truly unique timbres, from vintage Moog basses to aggressive MS-20 style leads.
- Extensive modulation matrix and flexible envelopes/LFOs empower complex, evolving sounds perfect for pads, sequences, and effects.
- Studio-grade built-in effects polish patches without needing external plugins.
- MPE support and host-syncable arpeggiator open doors to expressive and rhythmic creativity.
- Award-winning reputation and a vast preset library make getting started easy and inspiring.
Negatives:
- High CPU usage can challenge less powerful systems, requiring careful workflow management.
- Steeper learning curve compared to “preset factory” synths; mastering modulation routing takes time.
- No standalone version means you need a DAW host to use Diva.
Our verdict? If you crave authentic analog warmth combined with deep sound design flexibility, Diva is an absolute must-have. Its sonic character and versatility justify the CPU cost and learning investment, especially for producers who want their electronic music to stand out with rich textures and dynamic expression.
Remember the question we teased earlier: Can Diva really replace hardware analog synths? While it can’t replicate every tactile nuance, Diva’s sound quality and modular freedom often surpass hardware limitations, making it a go-to weapon in the modern producer’s arsenal.
🔗 Recommended Links for Further Exploration
👉 Shop u-he Diva on:
Other Synths to Explore:
- Arturia V Collection: Amazon | Arturia Official
- Xfer Serum: Amazon | Xfer Records Official
- LennarDigital Sylenth1: Amazon | LennarDigital Official
Recommended Reading:
- “Welsh’s Synthesizer Cookbook” by Fred Welsh — a classic guide to analog synthesis techniques. Amazon Link
- “Sound Design: The Expressive Power of Music, Voice and Sound Effects in Cinema” by David Sonnenschein — for understanding sound design in broader contexts. Amazon Link
❓ FAQ: Your Most Pressing Diva Questions Answered
What features make Diva VST ideal for electronic music sound design?
Diva’s real-time analog circuit simulation stands out, providing authentic warmth and harmonic complexity. Its modular oscillator and filter modules allow producers to mix and match classic synth components, enabling a vast sonic palette. The extensive modulation matrix, including host-syncable LFOs, envelopes, and MPE support, gives dynamic control over evolving textures, essential for electronic music’s rhythmic and atmospheric demands. The built-in effects section (chorus, delay, reverb, phaser) further refines sounds without external processing.
Read more about “u-he Diva Review (2025): The Ultimate Analog Synth Experience 🎹”
How does Diva VST compare to other synths for electronic music production?
Compared to synths like Arturia V Collection, Serum, or Sylenth1, Diva excels in analog authenticity and sonic character but demands more CPU power. Serum offers wavetable complexity and ultra-clean sound, ideal for modern EDM, while Sylenth1 is lightweight and great for trance supersaws. Diva’s strength lies in vintage warmth and modular flexibility, making it perfect for producers prioritizing organic sound design over sheer unison voices or digital precision.
Read more about “Reason Studios DAW Uncovered: 13 Reasons to Love It in 2025 🎛️”
Can Diva VST create unique textures and atmospheres in sound design?
Absolutely. Diva’s Triple VCO oscillator with continuous waveform blending, combined with Uhbie and Multimode filters, allows for lush, evolving pads and ethereal textures. Its MSEG envelopes and flexible LFOs enable slow, complex modulations that breathe life into static sounds. The modulation matrix supports creative routing, such as routing aftertouch to filter resonance or oscillator feedback, producing unique, expressive atmospheres.
Is Diva VST suitable for beginners in electronic music production?
Diva is powerful but complex. Beginners may find the interface and modulation options overwhelming initially. However, the extensive preset library and intuitive modular layout make it approachable with some patience. We recommend newcomers start by tweaking presets tagged for bass, leads, or pads and gradually explore modulation routing. For those willing to invest time, Diva offers a deep learning curve with rewarding sonic results.
Read more about “What Is a Virtual Instrument in Music Production and How Does It Work? 🎹 (2025)”
What are some popular electronic music genres that use Diva VST?
Diva is widely used across genres including:
- Techno and Tech House for its punchy basses and warm stabs.
- Drum & Bass for aggressive growls and reese basses.
- Ambient and Chillout for lush pads and evolving soundscapes.
- Synthwave and Retrowave for authentic 80s analog tones.
- Electro and Progressive House for dynamic leads and rhythmic sequences.
Read more about “🎛️ The 25 Best VST Plugins to Elevate Your Music in 2025”
How can Diva VST be integrated into a digital audio workstation for sound design?
Diva runs as a VST3, AUv2, AAX, and CLAP plugin inside most major DAWs (Ableton Live, Logic Pro, FL Studio, Cubase). Load Diva on a MIDI track, use your MIDI controller or DAW piano roll to play notes, and automate parameters via your DAW’s automation lanes. Diva supports host-syncable LFOs and arpeggiators, allowing tight integration with your project’s tempo. Use DAW freeze and bounce features to manage CPU load during complex sessions.
What tips improve sound design results when using Diva VST in electronic music?
- Start with presets and tweak oscillator/filter combos to learn their sonic impact.
- Use the Trimmers panel to add subtle voice drift and detune for analog realism.
- Experiment with modulation matrix—assign envelopes and LFOs to unexpected parameters like feedback or filter drive.
- Balance CPU by working in Draft mode during sound creation, then switch to Divine mode for final rendering.
- Layer Diva patches with other synths or effects (e.g., Serum’s FX rack) for hybrid sounds.
- Use MPE controllers for expressive, dynamic playing.
- Freeze or bounce tracks early to keep your session smooth.
📚 Reference Links
- u-he Diva Official Product Page: https://u-he.com/products/diva/
- u-he Diva Manual and Whitepapers: https://u-he.com/downloads/manuals/plugins/diva/Diva-user-guide.pdf
- Sound On Sound Review of Diva: https://www.soundonsound.com/reviews/uhe-diva
- Resident Advisor Review: https://ra.co/reviews/36311
- Facebook Group Discussion on Plugins and Sound Design Techniques: https://www.facebook.com/groups/536394163779203/posts/1630109941074281/
- Arturia V Collection: https://www.arturia.com/products/software-instruments/sem-v/overview
- Xfer Serum: https://xferrecords.com/products/serum
- LennarDigital Sylenth1: https://www.lennardigital.com/
- Plugin Boutique Diva Search: https://www.pluginboutique.com/search?q=diva
- Amazon Search for u-he Diva: https://www.amazon.com/s?k=u-he+Diva&tag=bestbrands0a9-20
