Sonic Dynamics

Sonic Dynamics is a powerful stereo compressor/limiter plug‑in by Rave Generation, inspired by a classic analog dynamics processor design. It delivers authentic vintage character and modern flexibility through detailed analog modeling.

Two emulation modes are provided: Modern/Rev D for clean, precise dynamics (using THAT2180 VCA, low noise and fast envelope response) and Vintage/Rev C for colored, "musical" compression (with DBX2150-style VCA, more distortion, ripple-induced saturation and slower, pumping envelopes).

Sonic Dynamics faithfully captures soft‑knee curves, separate peak/RMS detection, sidechain gating, and stereo linking behaviors of its hardware predecessor, while adding modern conveniences (mix control, high-pass sidechain filter, etc.). The result is an analog‑flavored compressor/limiter with gate and sidechain capabilities that is equally at home on sources from vocals to drum bus and mix bus.

Key Features

• Compressor/Limiter: Feed-forward VCA compressor with controls for threshold, ratio, attack, release, knee, and make-up gain. In Limit mode, it uses a high ratio and fixed attack/release for fast, transparent limiting. Soft knee gives a smooth transition, while hard knee is abrupt; detection can be Peak or RMS.
• Low-Frequency Relax (De-Rumbler): The Lo Freq Relax HPF cleans up sub-bass before detection. It is a cascaded 24 dB/oct high-pass filter whose cutoff is controlled by the knob. Use this to prevent deep bass hits (like kick or low-end rumble) from over-triggering compression. For example, setting it to 80 Hz can avoid excessive pumping on bass-heavy tracks. At 0 Hz this feature is disabled.
• Sidechain Routing: The main inputs feed both the audio output and the internal sidechain detector. If an external sidechain is available and Ext SC is enabled, the plug-in uses the auxiliary inputs as the detection source for both compressor and gate. This allows ducking or key-controlled effects. The Lo Freq Relax HPF is always applied to whichever source is used for detection.
• Stereo/Dual-Mono Processing: By default, Sonic Dynamics is a true stereo processor. With Stereo Link on, one envelope (from the louder channel) drives both channels' VCAs. With Link off, it operates in dual-mono: each channel's compressor and gate respond independently.
• Gate/Expander: After the compressor section, Sonic Dynamics applies a gate on each channel. The gate threshold and decay are set by Gate Threshold and Gate Rate. If the signal falls below the threshold, the gate closes: it remains open for a fixed "hold" time (the Gate Rate setting) then exponentially decays shut. This models the hardware's gate circuit (100 kΩ/1 µF network). Use the gate to silence noise or bleed during quiet passages. The gate detector also follows the selected sidechain source.
• Auto and Mode-Dependent Control Behavior: Sonic Dynamics automatically disables or ignores certain controls when specific modes are active, mirroring the behavior of the analog hardware:
  • Limit Mode: When Limit mode is engaged, Attack, Release, and Ratio controls are disabled. The compressor operates with a fixed, ultra-fast attack, a musical release, and an extremely high ratio (for true peak limiting). Adjusting these knobs has no effect in Limit mode.
  • RMS Mode: When RMS detection is selected, Attack and Release controls are disabled. In this mode, the envelope timing is set internally for slow, program-dependent behavior, and the knobs are bypassed.
  • LED Meters: The gain reduction (GR) and output meters remain active in all modes, giving you instant visual feedback on compression, gating, and output levels with no added latency.