If your guitars don't sound as good as you want them too, this article explores some tactics you can try out.
Tuning 808s in Garageband is really quite easy, and it doesn't take as much work as you think.
While creating sliding 808s in Garageband is possible with the Deep Sub Bass Synth, it's much better to use third-party plug-ins.
You can use parallel compression in Garageband in two different ways.
How to install plug-ins in Garageband iOS, including a list of free and paid software you can try.
A list of some of the best and most useful plug-ins for vocals, including mixing, editing, and FX plug-ins.