Check in control panel that your sound system is properly configured.
Check in P3d that you have the sounds assigned to the proper device.
check that you do not have any devices muted.
check that you do not have the "q" key toggled.
check that "mute on lost focus" is UNchecked.
check-list standard relativa ai problemi di suono. Spero possa aiutarti a risolvere