

You can mess with the levels of all three tracks to find that sweet spot where it feels nice and live and vibey, but then also has the precision and processing of the solo tracks. This will give you the original "live" performance vibe, AND then a more precise take of each instruments' performance to add some effects to, and pan a little wider to give everything some space in the mix. Then pan the piano track to the left 30%, bring down the volume a bit, and add a little reverb. Then pan the guitar-only track 30% to the right, and bring down the volume a little bit. What you can do then, is keep the original track as is. Then create a new track and record a SECOND take of just the piano.

I, myself, learned a lot about how to program drums just by dissecting the Drummer Track. While it certainly has limitations, the Drummer Track (including the Smart Drummer in iOS) is a great tool for the rookie producer.

Control-click a selected region, then choose Split at Playhead from the shortcut menu. Move the playhead to the point where you want to split the regions, then do one of the following: Choose Edit > Split Regions at Playhead.
GARAGEBAND HOW TO SPLIT STEREO TRACK MAC
You know what? Here's an interesting idea. In the GarageBand on Mac Tracks area, select the region or regions you want to split.
