A4-1B Perpetual Plugin License + 1 year SC Native

Analog-modeled opto valve compressor plugin, real-time DAW automation, high-pass and de-essing tools, VST3 AU AAX, perpetual license with Synergy Core access.

Classic analog warmth, now in your DAW

The Antelope Audio A4-1B plugin faithfully brings the warm, smooth tone of vintage analog compression into your digital workflow. Modeled after the revered A4-1B Analog Opto Valve Compressor, this plugin replicates every detail of the original's tube circuitry and custom transformers to deliver unmistakable analog warmth and dynamic character. Whether you're enhancing vocals, tightening a bassline, or gluing a mix together, the A4-1B offers the signature sound of classic optical compression with the flexibility of modern digital control.

Real-time control and modern flexibility

Designed for professional producers and engineers, the A4-1B integrates seamlessly with your favorite DAW using VST3, AU, or AAX formats. Real-time automation of critical parameters like Attack, Release, Gain, and Threshold allows for dynamic mix shaping. Advanced features such as high-pass, low-pass, and band-pass sidechain filtering, along with a precise de-esser mode, make it a versatile tool for a wide range of audio tasks—from transparent vocal leveling to deep tonal sculpting.

Perpetual license with Synergy Core bonus

This perpetual license ensures lifetime access to the plugin, and it also includes a one-year Synergy Core Native membership, giving you additional access to premium plugins from Antelope's acclaimed effects suite. The A4-1B plugin is a powerful addition to any studio, combining vintage sonic charm with modern precision.

Features

• Delivers the classic sound of a tube-based opto valve compressor
• Faithfully emulates analog hardware, including transformers and tubes
• Works in all major DAWs (VST3, AU, AAX) with full parameter automation
• Includes advanced filtering options for precise sidechain control
• Built-in de-esser mode for clean, controlled vocals
• Offers smooth, musical compression for vocals, bass, and mix buses
• One-time purchase with lifetime license (no subscription required)
• Comes with 1-year Synergy Core Native membership for extra plugins
• Intuitive interface modeled after original hardware unit
• Ideal for engineers seeking analog tone with digital convenience