Logic Pro and Logic Express: No sound with Mac Pro

Issue or symptom

Logic does not output sound when you use the built-in audio hardware on the Mac Pro.

Solution

Versions of Logic prior to 7.2.3 are not compatible with the built-in audio hardware on the Mac Pro — they do not allow the outputs to be assigned in Logic's Audio > Audio Hardware & Drivers window.

Logic Pro and Logic Express 7.2.3 provides access to all three outputs available on the Mac Pro:

• Built-in Output (the speaker)
• Built-in Line Output (the line out jack on the back of the Mac Pro)
• Built-in Digital Output (the optical audio output on the back of the Mac Pro)