What is the difference between JACK1 and JACK2?
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JACK 1 and JACK 2 are equivalent implementations of the same protocol. In most cases, it doesn't matter which one you choose. unless you have a specific reason for doing so. A common misconception is that JACK 2 is a newer version, when in fact, both versions are developed alongside each other.
More details and information about the differences between JACK 1 and JACK 2