I need to sharpen a specific note (acoustic guitar) with some slight EQ--the string was a little dull and I want to punch it up just a little. The note is an F#. If I go to the parametric EQ effect dialog in my audio software (happens to be Sonar), I can enter a specific frequency to which I would like to apply gain. How do I know which frequency to use if it's an F# I'm interested in?