KORG PA4X 76 - Manual (Page 669)

Effect parameters |665
VOX Treble Booster
Vintage booster of high frequencies.
a Drive 0...99 Amount of the boost effect
b Level 0...99 General level
c Tone 0…100 Tone of the effect
d Wet/Dry Dry, 1:99…99:1,
Wet Balance between the wet and dry signal
Src Off…Tempo See DMS (Dynamic Modulation Source)
Amt –100…+100 Amount of modulation source