Toa M-864D Ver.2.2.0 - Manual (Page 23)

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[tone]
Roughly displays the frequency characteristics curve set with the tone control.
Frequency characteristics are indicated by a flat straight line when BASS, MID and TREBLE gains are all set
to 0 dB.
For tone settings, see p. 52 , “Function Box.”
[fBS]
Roughly displays the frequency characteristics curve of the Feedback Suppressor (FBS) filter.
For FBS settings, see p. 54 , “Function Box.”