Grundig 30GB - Manual (Page 101)

101
Section Repeat
You can set a specific section and play it repeatedly.
1.
Press the [A-B] button shortly at the position to start repeated play.
The [A→] icon is displayed on the screen.
2.
Press the [A-B] button shortly again at the position to finish repeated
play.
The [A↔B] icon is displayed on the screen and the selected section is played
repeatedly.