No worries, I gotcha~
So, to activate it, use the event "script" tag, and put
$gameVariables.vhsFilter = true;
To configure it:
$gameVariables.vhsAmp = value
$gameVariables.vhsLines = value
$gameVariables.vhsSpeed = value
$gameVariables.vhsStatic = value
vhsAmp is the amplitude
vhsLines is the amount of lines, iirc
vhsSpeed is how fast it goes
vhsStatic is how much noise there is