Vox VT80+ - Manual (Page 20)

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Effect on/off (CH1, 2, 4 switches)
In Preset or Manual mode, you can press the VFS5’s CH1, 2 or CH4 switches to
turn PEDAL, MOD/DELAY, and REVERB effects on/off respectively.
NOTE: If the effect is turned off because you used the VALUE, DEPTH, or
REVERB knob, the CHANNEL switches will have no effect.
NOTE: The effect on/off status set by the VFS5’s operation is not saved in
the program.