Identifying and correcting harshness, muddiness, and resonance buildup is crucial for achieving a clean, professional sound when mixing and mastering. Two plugins stand out: Smooth Operator Pro by Baby Audio and Soothe 2 by Oeksound.
Both audio plugins promise intelligent, transparent resonance suppression but take slightly different approaches. Smooth Operator Pro offers a fast and creative workflow with robust per-node control. At the same time, Soothe 2 is known for its natural, musical character, which has become a secret weapon for countless professional engineers.
In this article, we’ll break down the key features, strengths, and differences between Smooth Operator Pro and Soothe 2 so you can decide which mixing and mastering plugin best suits your needs. Whether polishing vocals, cleaning up drum overheads, or smoothing out entire mixes, having the right plugin can make a huge difference.
Let’s examine the comparison and determine which one should be included in your mixing and mastering toolkit.
What Is Smooth Operator Pro?
Smooth Operator Pro is Baby Audio’s advanced spectral processor that balances harshness, muddiness, and masking across your tracks. It employs a “machine-guided” process to intelligently detect and correct problematic frequencies, ensuring that phase issues are avoided and the natural character of your audio is preserved.
Key features include:
- Global threshold control with fine-tuned detail and isolation settings
- Unlimited EQ nodes with independent override control
- Advanced stereo processing with LR and MS options
- Focused compression section with adjustable knee, ratio, attack, and release
- Makeup gain controls and visual monitoring tools
- External sidechain for ultra-precise frequency ducking
Smooth Operator Pro builds significantly on the original version, offering a comprehensive suite of professional tools without compromising ease of use.
What Is Soothe 2?
Soothe 2 by Oeksound is the industry’s leading dynamic resonance suppressor. It automatically detects harsh frequency buildups and gently attenuates them in real time. Soothe 2 excels in making instruments and vocals smoother, cleaner, and more natural, without the heavy lifting of manual EQing.
Key features include:
- Dynamic suppression across thousands of narrow bands
- Soft and Hard processing modes for control over response
- Sharpness, Selectivity, Attack, and Release controls
- Delta monitoring mode to hear precisely what is being removed
- Full-band sidechain input for intelligent frequency ducking
- Highly regarded de-essing and vocal smoothing capabilities
Soothe 2 is widely used by top engineers and producers for cleaning up guitars, vocals, drums, and even full mixes.
Smooth Operator Pro vs Soothe 2: Feature Comparison
| Feature | Smooth Operator Pro | Soothe 2 |
|---|---|---|
| Ease of Use | Simple threshold control, fast results | Simple but slightly deeper learning curve |
| Node Control | Unlimited nodes with per-node overrides | Global curve, no independent node settings |
| Sidechain Support | External sidechain with frequency-specific ducking | Sidechain suppresses specific frequency bands |
| Spectral Compression | Full control over ratio, knee, attack, and release | Available but less customizable |
| Stereo Processing | LR, MS, stereo link/unlink options | Full stereo support, but no independent channel control |
| Suitability for Vocals | Excellent, highly customizable | Outstanding, extremely natural de-essing |
| Overall Sound | Hi-fi, clean, and transparent | Natural, subtle, musical |
| Price | More affordable ($29–$79 for V1 users) | Higher price but offers a 20-day free trial |
Which Plugin Is Right for You?
Choose Smooth Operator Pro if:
You want detailed control over every frequency zone, enjoy tweaking individual problem areas, and require powerful external sidechain options for highly targeted mixing. It’s fast, flexible, and incredible, especially if you want modern, polished mixes with minimal effort.
Choose Soothe 2 if:
You prefer a “set it and forget it” approach with incredible transparency. You want a plug-and-play solution for smoothing vocals, guitars, and cymbals. If natural-sounding mixes are your highest priority, Soothe 2 is hard to beat.
My Personal Take
I’ve used Soothe 2 in countless mixes for years, especially for vocals and cymbals. It’s almost magical how much it can improve a track with just a few tweaks.
However, after testing Smooth Operator Pro, I must say that its flexibility is truly next-level. I can now fine-tune specific frequencies with more precision than ever before. For complex productions with dense and crowded mixes, Smooth Operator Pro provides a level of detail that makes a noticeable difference.
Honestly, both plugins are amazing. It just depends on your style and needs.
Alternatives
In addition to Smooth Operator Pro and Soothe 2, Waves Curves AQ is another modern AI-powered plugin worth exploring. While it’s not explicitly built for dynamic resonance suppression, Curves AQ utilizes AI to analyze and automatically adjust your mix’s spectral balance. It focuses more on overall tonal shaping rather than surgical peak control, making it a strong complement to precision EQ plugins like the new FabFilter Pro-Q 4.
Final Thoughts
Smooth Operator Pro and Soothe 2 are no longer “nice-to-have” plugins; they are essential audio plugins for any serious producer or audio engineer.
If you want the best mastering audio plugin to polish your mixes, achieve a cleaner and more professional sound, and learn how to master songs correctly, investing in one (or both) of these plugins will elevate your productions.
Also, read another plugin comparison article of mine about FabFilter Pro-Q 4 vs Kirchhoff EQ
