Widex C-9 - Manual (Page 31)

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Zen program
Your hearing aid may be provided with a unique optional listening
program called Zen . It makes musical tones (and sometimes a
rushing noise) in the background . The Zen program may be used
alone (without amplification) in quiet when you are not required
to hear surrounding sounds . Or, it may be used with amplification
so that both the surrounding sounds and the generated sounds
(fractal tones and noise) are heard together .