Hello! I understand you're having trouble with no sound in the Divine Office app on your Mac running OS X 10.15.7. Let's work through this together to get your audio working.

First, may I ask:
- Is this no sound issue happening only with the Divine Office app, or is your Mac’s overall sound working fine in other apps?
- Are you playing audio within the app and just not hearing anything, or does the app itself not start playback?
- Have you tried any steps so far like restarting the app or your Mac?

Once I have a bit more detail, I can guide you through some straightforward steps to hopefully fix this.

Meanwhile, here are some general initial things you can check inside your Mac and the app:

1. Check System Volume & Mute:
- Click the volume icon in your Mac’s menu bar and make sure the volume is up and not muted.
- Also check System Preferences > Sound > Output tab and confirm that the correct output device is selected.

2. Within Divine Office App:
- Ensure that the audio player’s volume is not muted or turned down.
- Try pausing and replaying the audio.

3. Restart the Divine Office App:
- Quit the app completely (use Cmd + Q), then reopen it.

4. Restart your Mac:
- Sometimes a simple reboot can clear up audio routing glitches.

5. Check for App Updates:
- Make sure the Divine Office app is up to date via the App Store.

If none of these work, we can dig into settings like checking if other audio apps play sounds correctly to isolate the issue, or if your audio output devices are functioning properly on this OS version.

Let me know your observations so far! I’m here to help sort this out.