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The number of tracks that GarageBand can have is directly proportionate to the amount of processing power and RAM your computer has. Modern Macs are powerful enough that you almost don't need to worry about track count anymore. If your Mac is a little older or if you're working on a project that has a lot of tracks so the lot of different effects on each, you may start running into some responsiveness problems. If your processor is working too hard, the top of the playhead will start to glow yellow, orange, and then red if things are getting really tight. Luckily there is something you can do when this happens. You can lock a track or freeze it.
This protects a track from being edited, but also it renders the track to the hard drive and plays that fully rendered version back while you play your project. This frees up system resources and in many cases allows you to keep working. From the Track menu, you'll need to select Show Track Lock and then on all of your tracks in the track header you'll get a little padlock icon. This lets you choose which track should be frozen. Choose a track or several tracks you might not need to interact with for the time being. I'm going to just go ahead and click the Lock button. I'm going to click it on Acoustic guitar, on Bass guitar, and on both of the Fat Stack guitars.
When it's colored neon green it's locked. Now that it's locked there is no way for you to accidentally edit something or erase something. I can't actually click and drag this track out of time. It will tell me the track has locked. I must unlock it before making changes, and I can either unlock it right here, or click Cancel and unclick the green padlock. But also your computer should exhibit more responsiveness, and if your Playhead was displaying orange or red it should fade back toward its normal color. When you press Play the first time any tracks that are locked get rendered.
You can press Truncate if you want to stop right at that point and get to playing, so only do part of it, or just let it go. Of course you can cancel. (Music playing) Now we have those four tracks not being processed in real-time anymore, but playing from their rendered versions off the hard drive.
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