Toa DP-K1 - Manual (Page 29)

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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. Pressing this button permits the polarity to be reversed.
(5) Mute button [Mute]
Displays the ON/OFF setting status of the mute function for each channel. Press this button to determine
whether (ON) or not (OFF) to use the mute function.
Setting the mute for the latter input gain to ON switches the corresponding gain box in the flow view to the
display below.
[Example when Input 1's mute is set to ON]
Setting the mute for the output gain to ON switches the corresponding mute box in the flow view to the
display below.
[Example when Output 1's mute is set to ON]