GarageBand Tuner

Edit: It seems Apple must have been listening. GarageBand V2 has a built in instrument tuner. Now you have no excuse not to be in tune! The following instructions still work for GarageBand V1

Where's the Tuner?

One of the biggest disappointments to me of GarageBand - seeing as there is great support for guitarists in the app - with the built in amp simulators was the lack of a guitar tuner.

Grab a Free guitar tuner

Salvation is at hand my iBrothers and Sisters! Rejoice in the joy of Emagic's free little audio units tuner

Install the tuner

1st step

Download Emagic's ET1 audio units guitar tuner

2nd step

Double click on the appropriately named "Install ET1" icon on your desktop - then follow the instructions.

3rd Step

Launch GarageBand then create a new track, then double click on the track icon to bring up the track info. If the details are not showing for the track click on the little triangle. From the drop down details box, click on one of the pop up lists and select ET1.

Then click on the pencil icon to see the guitar tuner's GUI.

Select monitor to on to listen and tune your guitar. Now you've got no excuse to not be in tune...

Many thanks to RicP for introducing me to the ET1.