How do I control the volume of a second device while using a different device mode (Punch Through Volume)?
To activate Punch Through Volume, press your desired device mode key (e.g., TV), press and hold VOL+, then press the second device mode key (e.g., SAT), and release VOL+. The LED will flash once to confirm the setting is activated, allowing VOL+/VOL- commands to control the second device's volume. (Page 7)
From the official Hama Universal Remote Control 4in1 8in1 manual, page 7
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