PURE TWILIGHT Owner's Manual page 25

Trim station list
Quickly remove inactive stations (marked with ?) from the station list.
Dynamic Range Control
Change the Dynamic Range Control (DRC) settings. DRC makes the
quieter sounds in a digital broadcast easier to hear at a low volume or in
a noisy environment.
Off (default) Any DRC broadcast sent by the station is ignored
Half DRC level is set to half that sent with the broadcast
Full DRC level is applied as sent with the broadcast
Check with broadcasters to see if a station broadcasts DRC information
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