I just upgraded to Logic Pro from Garage Band. I started a song. When I added a second loop it doesn't make any sound when the song plays.
Make sure that Software Instrument Loops are on MIDI tracks and audio loops are on audio tracks. That has tripped me up before.
The green ones are MIDI and go on an instrument track. The blue ones are audio and go on audio tracks.
To be exact:
The green ones contain both audio and midi: on a MIDI track the MIDI is used, on an audio track the audio is used. Blue ones are audio only.
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