N4 is a powerful multi-effect plug-in designed to authentically emulate a vast range of audio equipment and systems, including electrical, digital, and acoustic sources. It offers a practical and cost-effective alternative to traditional hardware, enabling users to explore new creative directions with highly realistic sound reproduction. Utilizing a sophisticated dynamic sampling approach based on Volterra series nonlinear convolution, N4 supports loading libraries and entire plug-ins crafted with state-of-the-art technology. Since its inception in 2003, N4 has been a flagship achievement, available in various formats such as VST2, VST3, AAX, and AU, ensuring compatibility with all major digital audio workstations and editing software.

N4 operates seamlessly on both Windows and macOS platforms, supporting 64-bit architecture and the latest CPU generations. Its CORE 15 audio engine enhances processing capabilities, while integrated features like the library finder, preset browser, and Nebula setup streamline workflow. The plug-in supports a broad range of Acqua and Nebula libraries, including legacy versions, and works in conjunction with the Aquarius application for extended functionality. The latest version introduces improvements such as native side-chain support, adaptive latency, and updated SDKs for VST3 and AAX, along with enhanced stability and compatibility with modern operating systems including macOS Catalina and Windows 10.

The bundled Cross-Platform Commercial Library (CPCL) version 5 offers enhanced integration with Aquarius and includes updated versions of popular libraries like Rose and Violet Acqua, plus a selection of skinned Nebula libraries. Acqua libraries deliver complex simulations by merging multiple emulation presets with custom user interfaces, while Acqua Effect plug-ins function both as standalone tools and within N4 for additional networked operation capabilities. Developed by Acustica Audio, a company renowned for combining IT expertise with audio engineering, N4 leverages proprietary sampling technology to recreate a wide array of audio processors such as EQs, compressors, reverbs, and more, providing an unparalleled level of authenticity for music production and sound design.