TechniSat DIGITRADIO Bike 1 Manuel D'instructions page 38

If there are stations on the set frequency or channel that have not yet been
saved in the station list, these will now also be saved.
6.2.8 Volume control (DRC)
The volume adjustment menu item is used to set the compression rate, which
compensates for dynamic fluctuations and the associated volume variations.
Open the menu and use the Down◀, Up▶ buttons to select the
>
[Volume adjustment] entry.
Press the Select/Info button.
>
DRC high
DRC low
DRC off
Confirm by pressing the Select/Info button.
>
6.2.9 Delete inactive transmitters
This menu item is used to remove old and no longer receivable channels from the
channel list.
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-High compression
-Low compression
-compression switched off.