Olympus DS-30 Instructions Manual page 194

Noise Cancel Function (Noise Cancel)
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Notes
• If you set Noise Cancel to "Low" or "High", the setting remains valid until it's set to "Off".
• Noise cancel cannot be used during fast playback/slow playback (☞ P48).
• Noise Cancel is not available while the Voice Filter (☞ P57) is set.
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Press the STOP button to close the menu.
If the recorder goes to the menu screen during
playback, press the 0 button to close the menu
screen.
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The will appear on the display.
a Noise Cancel indicator