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what does the master tone actually do ?

I think that it's just a band pass filter? I'm not really sure but I believe from what I can physically hear on a passive bass, that the high frequency range is allowed to come through more when it is turned up. Tone all the way up equals the true sound of your bass (all frequencies are allowed to pass) and passive electronics. I'm sorry if I'm wrong or if I may have confused anyone...
 
It's basically just a lowpass filter with adjustable frequency. In other words, if it's all the way up it does nothing to the tone and cuts the high frequencies when turned all the way down.

Ps. Tech nerds; yes, I know it does *a little something* even when turned up but let's not get into technicalities now ;)
 
does it boost the bass in one direction and or boost the treble in the other direction, or is it really a pickup selector ??

You're thinking of a tilt EQ.

Are you talking about the tone control on a bass, or a control on a pedal or amp or something?

The tone control on a bass is nothing more than a capacitor with a pot to vary how much signal it receives.

As you roll down the tone knob, the capacitor cuts more of the high end. There is no change to the low frequencies.
 
i'm talking about the master tone on a bass, right now i have active pickups and keep everything in the middle unless i want to add more bass or treble, but i guess with passive pickups you run the master tone full only allowing you the option of cutting the treble