Wren Wiki

You will need to select a sound output device from the setup/Audio devices main menu.

You will need an output module in the patch to route the patch signals to.

Mute may be on, in which case there will be a flashing yellow sign in the top pane indicating this. Use the Action menu to toggle this. The Action menu will also show the current keyboard shortcut for this.

Ctrl+D will toggle mute on / off.