I'm a little confused about the way the 'EQ parameter' settings work
when editing (creating) user customized instrument voices in 'Sound
Creator': effects/eq page (page 90 of PSR2000 owner's manual).

There appears to be a separate gain setting for Low Frequency and
High Frequency. You first choose a specific low & high frequency
value, and then a select a gain (+-) amount. I'm hoping to get some
clarification about how this works:

Suppose I set the Low Frequency to 125Hz and its' corresponding gain
to +3db. Does this boost all frequencies at 125Hz and below by 3db,
or does it only boost the 125Hz frequency itself? The same question
applies to the High Frequency. If I set the High Frequency to 4.5kHz
and set its' associated gain setting to +3db, does this boost 'all'
the frequencies equal to and greater than 4.5khz or just the specific 4.5khz frequency?

Thanks, - Scott