i wouldnt say that adjusting your tone to the notes on the bass is right..
each note has many diff freqs produced soundwise, pitchwise it's diff. for eg, a simple A note can have a signal going at 15kHz too.
the eq is supposed to be set for overall tone.. bass for boom, mid for punch, and highs for bite. most bassists scoop their mids (lower mids) for a clean and smooth tone e.g.stu hamm(he doesnt realy scoop but that's the kind of tone i can think of right now). to hear really punchy bass listen to jaco. he sets the eq to a frown (on a graphic eq, mids go up, so it's like a mouth that frowns. similarly, u can smile by scooping the mids).
tone setting is totally up to individual pref or the type of song u are going to play.
the hartke amp at 4tones also has a preamp section. that controls the gain for each channel: the tube, or solid state.
amps can be powered by 2 means. tubes or transistors (solid state) each sounds uniquely diferent. the hartke is driven by both.
a tube sound is generally warmer and stronger imo. whilst the solid state sounds 'dryer'. read up on tubes and solid state amps. i'm sure books can give u a better insight than me. heh.
so by mixing them both u get a unique sound.. kinda like mxing the volume control on a passive bass with 2 pups.
finding ur tone takes time. i havent found mine yet! lol. keep on experimenting!