If there is no local audio from the presentation, please check the following settings.
In the settings, verify the Periferal devices. The speaker used is defined in the Default speaker setting.
When these settings are correct, stop and start the presentation from the MTR panel. The speaker is only activated when the presentation starts. If the wrong speaker is set when the presentation starts, simply setting the correct speaker will not be sufficient. The audio must be activated again, by stopping and starting the presentation again.