Just FYI, if you don't get along with GarageBand, there are some very affordable hardware recorders these days. Zoom and Tascam make a few models, that you can also use as digital interfaces. Some of them have the same form factor as the good ol' portastudio type recorders. The more spendy versions also double as mixers.
If you're recording rehearsals, you might want to look at the Zoom H6. Small, portable, comes with a really good stereo mic, records up to 6 simultaneous tracks. Not my fave for overdubs though....