Toa DP-SP3 - Manual (Page 22)

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(2) Fader
You can change the signal level of each channel by moving this fader up and down.
(3) gain indication button [gain (dB)]
Indicates each channel signal level in dB.
If you press this button, a dialog for gain setting is displayed,
enabling you to set the gain by directly entering a numerical
value.
(Setting range: –∞ to +12 dB)
You can also change the gain in 0.5 dB units with the Up and
Down buttons located on the right side.
(4) Reverse polarity button [polarity]
Displays each channel’s polarity. Clicking this button permits the polarity to be reversed.
(5) Mute button [Mute]
Click this button to determine whether (ON) or not (OFF) to use the mute function.
Displays the ON/OFF setting status of the mute function for each channel.