COMPulsion v1.2

Five Legendary Compression Types in One Precision Tool.

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Overview

COMPulsion delivers authentic analog compression with five meticulously modeled compressor topologies. From the transparent VCA precision to the slow, musical Opto, the aggressive FET attack, the smooth Vari-Mu warmth, and the ultra-clean Modern digital perfection, COMPulsion provides the exact character and response of classic hardware units. Featuring true Peak and RMS detection, Feedforward/Feedback topologies, profile-specific timing curves, program-dependent release, dual-stage release, and harmonic saturation, COMPulsion is the ultimate compression tool for tracking, mixing, and mastering. Oversampling up to 16x ensures alias-free processing for pristine signal quality.

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Key Features

Five Compressor Topologies

• VCA (Voltage Controlled Amplifier) - Clean, transparent, fast compression (SSL Bus, API 2500).
• FET (Field Effect Transistor) - Fast, aggressive, colored (1176, Distressor).
• Opto (Optical) - Slow, smooth, musical (LA-2A, LA-3A).
• Vari-Mu (Variable Gain Tube) - Smooth, tube warmth (Fairchild, Manley).
• Modern (Digital Perfection) - Ultra-transparent, surgical precision.

Advanced Compression Engine

• Peak/RMS Detection - Choose between instantaneous peak or smooth RMS detection.
• Feedforward/Feedback Topologies - Authentic compression architectures.
• True feedback behavior matching vintage hardware characteristics.
• 14 Ratio Options - From gentle to extreme limiting: 1:1, 1.5:1, 2:1, 3:1, 4:1, 6:1, 8:1, 10:1, 15:1, 20:1, 30:1, 50:1, 100:1, ∞:1.
• Precision Controls - Threshold: -96dB to 0dB (0.1dB steps) | Makeup: 0-24dB (0.1dB steps).
• Profile-Specific Attack/Release - Each topology has calibrated timing curves with independent scaling.
• Hold Time Control - 0-1000ms hold prevents premature release during transients.
• Auto Release - Adaptive release (10ms-2000ms) scales inversely with input level ratio for natural breathing.
• Program-Dependent Release - Opto and Vari-Mu profiles analyze 8-sample signal history for 0.5x-2x release scaling based on signal consistency.
• Dual-Stage Release - Opto and Vari-Mu feature characteristic fast initial (3.5x) + slow tail (0.35x) release curves with 35%/65% blend.
• Fine-Tune Mode - Shift + drag for ultra-precise control (0.1ms - 30 seconds) with adaptive sensitivity.
• Direct Value Entry - Shift + double-click on Attack, Release, Threshold, Makeup, HPF, or LPF to type exact values.
• Profile-Matched Soft Knee - Each topology features authentic knee characteristics.
• Ratio Curve Shaping - Spline-based ratio transitions with profile-specific exponents.
• Response Shape Modeling - Envelope follower curves match hardware behavior.

Lookahead & Precision

• Modern Profile Lookahead - 0-50ms configurable lookahead enables instantaneous attack on transients without overshoot, delivering surgical precision for drum bus and master chain applications.
• De-Click System - Frequency-aware click detection (0-100% intensity) with pattern-based adaptation intelligently eliminates compression artifacts while preserving natural transients.

Sidechain Processing

• Internal/External Sidechain - Use main signal or external key input with intelligent switching.
• Surgical Precision Filters - 1Hz resolution across 20Hz-20kHz (20,001 frequency options per filter).
• Dual Filter Architecture - Independent HPF (1-20000Hz) and LPF (20000-1Hz) with 4x internal oversampling.
• Linear Phase Mode - FIR filters for zero phase distortion.
• Minimum Phase IIR - Ultra-low latency Butterworth filtering.

Harmonic Saturation

• Odd Harmonics - Warm, tube-style asymmetric character.
• Even Harmonics - Smooth, tape-style symmetric warmth.
• Mixed Mode - Complex 50/50 blend for rich three-dimensional coloration.
• Profile-Specific THD Curves - Authentic 128-point transfer curves.
• Up to 16x Oversampling - Polyphase IIR half-band filters eliminate aliasing artifacts.
• Asymmetric Bias - 30% bias creates authentic analog-style uneven clipping.
• 5% Smoothing Filter - DC offset prevention with previous-sample blending.

Total Harmonic Drive (THD)

• Dynamic Saturation - 128-point transfer curve adds level-dependent harmonics (0-200% drive range).
• Profile-Specific Curves - Matched to each topology's harmonic signature.
• Dual-Stage EQ Shaping - Pre/post shelving for enhanced harmonic character.
• Symmetric/Asymmetric Blending - Symmetric & Asymmetric for complex harmonic content.
• 4x Internal Oversampling - Dedicated polyphase IIR oversampler prevents intermodulation distortion.

Parallel Processing

• Wet/Dry Mix - 0-100% blend with sample-accurate smoothing (50ms time constant) for New York-style parallel compression.
• Transient Preservation - Blend maintains punch while adding density and RMS level.
• Delta Mode - Listen to compressed signal only (wet - dry) for precision compression auditing and effect verification.

Real-Time Metering

• Input/Output Meters - Vertical true RMS meters with precise dB readouts (-100dB to 0dB range).
• Clip Indicators - 300ms hold visual warning for 0dBFS peaks.
• Gain Reduction Meter - Horizontal SSL-style meter (0-96dB range).

Professional Interface

• Resizable GUI
• Informative Tooltips

Intelligent DAW Integration

• Latency Compensation - Automatic PDC reporting.
• Sample-Accurate Automation - All parameters support DAW automation.

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Technical Details

Plugin Type	VST3
Supported OS	Windows 10+
Space Required	6 MB
Version	1.2