[LAU] OT: x42-autotune - Setting up with Jack

Hello, I'm looking to install the standalone application of x42-autotune ( http://x42-plugins.com/x42/x42-autotune ) on a Mac running the latest OS X. However, it appears this depends on installing JACK, and unfortunately the x42 README gives no further info. on what to do. For example, should I install JACK1 or JACK2? And once the best version of JACK is installed, what are the next steps? I know this is a bit off-topic, since I'm on a Mac and not using Linux. But I tried first contacting someone at x42, and have not heard back yet.... So I thought it wouldn't hurt to ask here, just in case the steps are the same (or someone here has done this on a Mac). Basically, I'm not a programmer, but do use computers frequently and should be fine with just a little more guidance than the nothing that I'm finding elsewhere! Thanks, Jim