Bogen Nyquist C4000 Series - Figure 4-5, Tone Page

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Step 3 On the Tone page, select the tone that you want to
sound.
Only tones that have not been hidden appear.
Figure 4-5, Tone Page
Note: Tones play continuously if one of three conditions exist: Its
Type is Alarm, times to play is set to 0, or length is set to 0.