If you have a favorite plug-in host application for your Mac, like Native Instruments Kore, MOTU Digital Performer, or Ableton Live (to name a few), you can use this simple trick to load your current setup every time you boot your Mac.
Go to System Preferences, and double-click on Accounts. Click on the Login Items tab and you’ll see a list of applications that will launch on startup. To add you own, simply click on the + symbol and browse to the desired file (such as a Kore Performance, Digital Performer file, or Ableton Live file).
Don’t check the Hide box as this will hide your app after you open it.
Now you can start your Mac and have everything ready to make music without a single mouse click.