Admin...How do you properly adjust "High" filter?

[kjzone]

Ref: Vogone 2.104

After I import the digital stereo wave file I play it with the Default settings that Vogone opens with. In most cases most of the vocal is removed.
FINE TUNING:
Next I select the LOW filter and play the song adjusting the INDEX LINE to the Left until I don't hear any Vocal. Up to this point your instructions are Clear and in most cases more Vocal is removed from the Default settings that Vogone opens up in. The NEXT step is to adjust the HIGH FILTER.

The instructions are not clear on the HIGH FILTER adjustment. PLEASE CLEARIFY.

I know that if I adjust the High Filter Index Line to the Left I will eventually hear the vocal coming thru.....BUT WHAT IS THE PROPER PROCEDURE FOR ADJUSTING THE HIGH FILTER? STEP BY STEP PLEASE!