Why does my Logic Pro X keep overloading?
When working on a Logic Pro project with a lot of audio tracks, software instruments, or plug-ins, a system overload alert might appear that interrupts playback or recording. System overloads can occur when your Mac doesn't have enough processing power to play back or record audio.
How do I fix the sound on Logic Pro X?
Open Logic Pro, then choose Logic Pro > Preferences > Audio/MIDI > Devices. Choose Built-In Output from the Output Device pop-up menu. Choose Built-in Microphone (or Built-in Input, depending on your computer) from the Input Device pop-up menu. Open and play back a project that's been experiencing issues.