Palsonic DVD/CD/MP3 Player DVD2030 - Manual (Page 26)

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Advanced Features
Remote Control Operation
MUTE
Press MUTE to mute the Audio output.
Press MUTE again to resume normal audio output.
Press RETURN to the main menu when PBC is on.
RETURN
VOL+ VOL-
Press Volume <VOL+> button to increase Volume.
Press <VOL-> button to reduce volume till no volume output.
PBC
During VCD playback.
Press PBC (playback control) to select PBC 0n and off.