Step 1: New project
Load up a new project using the Software instrument setting. You can of course open a previous file that has a great song part in and use that as your loop.
Step 2: Super saver
Make sure you save the file somewhere handy so that it’s easy to find in future. Hit the Save button when you’ve named and placed the file.
Step 3: Blank canvass
A blank GarageBand window is always a bit daunting. Use the plus button to create the tracks you want to build loops from.
Step 4: Software time
Pick the software instrument track each time. Plug in your USB keyboard if you have one. Or bring up the musical typing window (Shift+Apple+K).
Step 5: Pick an instrument
Now use the instrument finder on the right to pick an instrument type and then the instrument itself. Click on it and then hit a few keys to test it out.
Step 6: Record, re-record
When you are ready to go, hit the record button and play your track. You can use the delete key to remove poor takes. Repeat until you are happy with the take.
Step 7: Cheat a bit
Once your part is recorded you can double-click on it to bring up the midi data. Here you can tweak each note to make sure it is in perfect time.
Step 8: Add it up
When you are happy with your loop, head to the Edit menu at the top of your screen and then select Add to Loop Library. A new dialogue box will appear.