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SOL Studio Audio / Mastering Tools
SOL-4 — Transparent Limiter
with No Hidden Behavior
“Uncompromisingly clean — but it never strips away the harmonics your music needs.”
A professional mastering limiter that shows you exactly what it’s doing, sounds exactly as neutral as you want it to, and gets out of the way.
Intro price $39.90 Regular $69.90
VST3 Windows 10 / 11 64-bit Mac coming soon
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Oversampling 8x Maximum quality mode |
Latency 0 ms Zero-latency capable |
Processing M/S Full mid/side domain |
LUFS BS.1770 M / S / I metering |
True Peak 3-phase 8-tap FIR interpolator |
Presets 13 Factory + user saves |
Core Design
Built for mastering engineers who trust their ears.
Every parameter in SOL-4 does exactly what it says. No secret sauce, no hidden saturation. Just transparent, precise gain control.
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Zero Latency Mode Disable lookahead and oversampling for completely latency-free operation. Perfect for live monitoring, real-time adjustments, and CPU-critical sessions. |
Spectral-Dependent Release & Crossover Solo Separate release multipliers for low and high frequency bands, divided by an adjustable crossover frequency. Enable Crossover Solo to audition the low band in isolation — useful for setting the crossover point by ear. |
M/S Domain Processing All limiting happens in Mid/Side space. The S-Floor Link parameter gives continuous control over stereo width preservation — from fully independent to fully linked. |
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Delta Monitoring Hear exactly what the limiter is removing. Complete silence means no gain reduction. Audible content tells you precisely how hard the limiter is working — and what it costs. |
Transient Preservation Protect the initial attack of transients without allowing peaks to exceed the ceiling. Drums and percussion stay impactful, even at high gain reduction. |
Auto Release Modulation Automatically extends release time during dense passages to prevent inter-modulation distortion, then shortens during sparse material. Fully adjustable. |
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True Peak Limiting A 3-phase, 8-tap FIR interpolator detects inter-sample peaks. Combined with micro soft-clip at the ceiling, SOL-4 delivers robust true peak compliance at any oversampling setting. |
Detector Weighting Four K-weighting modes determine how aggressively the limiter responds to high-frequency content. From subtle (0.25) for acoustic material to flat (FLAT) for drum-heavy tracks. |
A/B Comparison + Undo Two independent parameter slots for instant side-by-side comparison. Full undo/redo history. Non-destructive workflow at every step. |
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Metering Suite
Everything you need to see. Nothing you don’t.
SOL-4’s metering gives you immediate, accurate feedback on what’s happening.
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BS.1770-4 LUFS — M / S / I Full loudness metering: Momentary (400 ms), Short-term (3 s), and Integrated with -70 LUFS absolute gate. All three values displayed simultaneously in real time. Click to reset. |
GR History Graph Scrolling gain reduction history for Mid and Side channels. Three scroll speeds (SLOW / MED / FAST) let you zoom from full-song overview to individual transient detail. |
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Knee Curve Display Live input/output transfer curve. The full knee width is always visible regardless of the KNEE setting — readable from 0 to 12 dB. |
MID / SIDE Solo + Output Meters Audition Mid or Side channels independently. Peak-hold output meters for Left and Right with True Peak display and ballistic LED-style response. |
Pricing
SOL-4 Mastering Limiter
$39.90
Regular price: $69.90
- — SOL-4 VST3 plug-in (Windows 64-bit)
- — PDF User Manual
- — 13 factory presets
- — Free updates within version 2.x
- — Support via info@solstudio.online
Requires Windows 10 or 11 (64-bit). Mac version in development.
No subscription. No iLok. No internet connection required after purchase.
