The HDHomeRun will attempt to automatically scan for channels the first time it is connected to power, and will occasionally do a background scan every few days, but you may still need to run an initial channel scan.
Some Roku models pass the audio through to the television to decode. This is supported by almost all televisions but must be configured on the Roku and/or Television.
1) Volume mode setting:
2) Roku audio settings:
3) Television audio settings:
If you still cannot get audio to work, please open a Support ticket and we will help you.