Action: Check the Merlyn application's volume settings. Check the computer's System Volume (system tray/menu bar) and ensure Merlyn is not muted and the correct output device is selected.
Step 2: Third-Party Device Check (The Chain)
Action: Manually check the volume controls on all external devices (Interactive Flat Panel/Speaker System). Merlyn can control the computer's volume, but not a separate speaker's physical knob or IFP setting.
Step 3: Cabling/Connectivity Check
Action: If volume control fails, temporarily connect your computer's audio output directly to a pair of headphones to rule out the external sound system entirely.