I have no sound when playing the timeline; altough the audio parameters seem OK in the Parameters/Audio equipment (I have the same parameters in the Audition software and any audio rush which is not audible in Premiere is perfectly audible in Audition).
The audio of the rushs when played in the Source Monitor are perfectly audible.
No audio track is muted.
Please help me to solve this issue.
Thank you for your precious assistance. In fact it was not the muting/unmuting icon that I had to activate but the solo icon of every track. After I have activated and then deactivated this icon on all tracks the problem has been solved.