If you are having problems with missing or incorrect audio on your converter box, there are a couple of things you can try.

Some DTV channels have multiple audio channels, and all channels may not be active at the same time. If the audio is incorrect or missing on just one channel, try tuning to that channel and pressing the "Audio", "SAP", or "MTS" button on your remote. You may have to press the button multiple times to get the audio back to where it should be.

If you have no audio on any channels on your converter box, check your converter box remote for a volume control or a mute button. With some converter boxes, you can control the volume with the converter box as well as the TV, so it's possible to have the audio turned down or off on the converter box.