TechniSat DIGIT ISIO STC Quick Start Manual page 52

You can now use the up / down arrow keys to highlight the desired operating
>
mode (TV or Radio), or Back to leave the menu.
Pressing the OK button confirms the selection and switches to the selected operating
>
mode.
The device switches to the last selected channel.
16.4 Volume control (ISI mode)
You have the option of adjusting the volume via your digital receiver. This facilitates
operation of the receiver, as it means you can access all the major functions on a single
remote control, and will only rarely have to resort to using the remote control for the TV.
To adjust the volume of your TV, press Volume + to increase the volume, and
>
Volume - to decrease it.
During volume adjustment, the currently set volume is displayed at the top of the
screen.
When you switch on the digital receiver, sound will be reproduced at the volume level
last set. When operating a Bluetooth audio device, please also note Point 8.4.7 in your
operating manual (headphone settings).
The volume control and mute button also control and mute the digital audio outputs
(not in the case of the Bitstream setting).
22.4.1 Switching to mute
To switch the sound off (mute), press the Sound on / off button - press this button
>
again to switch the sound back on.
Throughout the time that the volume is switched to mute, the
the upper right of the screen.
When operating a Bluetooth audio device, e.g. headphones, its volume can be
controlled when switched to mute without unmuting the device.
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symbol appears at