GBTOUCH DOES NOT WORK WITH THE CURRENT GARAGEBAND FOR MAC (VERSION AVAILABLE SINCE OCTOBER 2013). IT SUPPORTS ONLY GARAGEBAND '11 OR '09 FOR THE MAC.
You will need to do a few ESSENTIAL steps listed below that will only take a few minutes to get gbTouch operational. These steps are needed because gbTouch requires a (free) companion application called gbLink that is installed on the Mac where you have GarageBand. These steps usually only have to be done once and then you can use gbTouch just like any other iPad app. Read more about this in the user manual.
You can also watch the Getting Started video below or view the instructions in pictures form.
Getting Started with gbTouch Video
Because gbTouch feature upgrades may require changes to both gbTouch and gbLink, it's important to make sure your versions are in sync.
Having some issues with gbTouch? Be sure to read the article below for important information, even if you don't think you are running multiple controllers.