TC electronic SDN BHD 48 - Manual (Page 67)

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3 Mode selector
Click to switch between Strobe and normal mode.
Strobe mode: Sections of three red LEDs will slide left, when the played note is too low, and right when it is too high.
...out of tune (Chromatic scale-mode selected) ...in tune (C major scale-mode selected)
4 Play tone
Press PLAY TONE if you want to tune acoustically to a reference tone. The played note is “A” according to the set pitch
(default 440Hz).
The level of the tone can be adjusted using the small “speaker” handle located just below the PLAY TONE button.
5 Pitch
Sets the reference frequency. Default value is 440Hz and the range is from 438 to 445.
6 Mute
Press to mute the output of the tuner. Excellent if you need to tune visually only.
7 Scale modes
The following scale modes are available via the drop down menu:
TUNER