I went ahead and created the attached PATCH for you to install on your computer for GarageBand to remove all the audio effects with a single click.

Firstly click here to download NoEffects.patch file and then check out the video below. Note: the link will directly download NoEffects.patch file and it will then be available in your Downloads folder in Finder.

I hope this helps you to get great audio out of GarageBand for your upcoming Podcast.