"HINT: If don’t want to use an effect in a channel program, select either DELAY or
REVERB as the effect type, and turn the EDIT 1 knob all the way to the left. This will set the DELAY LEVEL or REVERB LEVEL to the minimum setting."
I never found a vox demo that worked so I could foward it to you.. But you might try web searching " vox demos VOX AD 15 VT-XL Amp "
Good Luck
Gordon