KORG PA4X 76 - Manual (Page 175)

Advanced editing of the Sound sets |171
Resetting the EQ
You can reset the EQ to the default (that is, ‘flat’) status.
1 Go to the Mixer/Tuning > EQ Control page.
Track Reset
2 Reset all the EQs, or a single EQ.
Reset the EQ on a single track/channel
▪ Touch the Track Reset button corresponding to the channel whose EQ you
want to reset.
Reset the EQ on all tracks/channels
▪ Touch the Reset All Tracks button.