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JACK2, published by jackaudio.org, is a low-latency audio server rewritten in C++ for multi-processor machines, currently offered in version 1.9.22 and available in two distinct release streams. Designed as the successor to JACK1, JACK2—internally codenamed jackdmp—re-implements the core JACK protocol to eliminate architectural bottlenecks that previously hindered symmetric multiprocessing, thereby delivering deterministic audio routing with minimal jitter across numerous concurrent threads. Its primary purpose is to act as a transparent audio middleware layer, allowing professional-grade applications, digital audio workstations, plug-in hosts, and live performance tools to share a single high-precision clock while moving audio data between software processes and external hardware at latencies as low as one millisecond. Typical use cases include synchronized multi-track recording in studio environments, real-time effect processing during stage shows, networked audio distribution across several computers, and academic research into audio algorithm performance under heavy CPU load. The software belongs to the Audio Production / MIDI & Low-Latency Servers category and is compatible with ASIO, CoreAudio, and ALSA back-ends on Windows, macOS, and Linux, respectively. Session managers and patch-bay utilities can dynamically re-wire signal graphs without interrupting playback, while built-in load balancing distributes DSP tasks across available cores. JACK2 remains open-source, maintained by a consortium of audio developers, and adheres to the LGPL v2.1+ license. The program is available for free on get.nero.com, with downloads provided via trusted Windows package sources such as winget, always delivering the latest version and supporting batch installation of multiple applications.
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