The only difference I can hear is the value of the cap, not the type. That's pretty impressive hearing when the signal going out the other side of the cap is to GROUND!
In a guitars tone circuit the signal passing through the cap goes to ground. The lower the tone control is turned down, the more treble travels through the cap to ground. Signal to the output jack doesn't pass through the cap. Despite that, some claim to be able to hear a difference between different cap types of the same value. Those folks should buy whatever cap that they believe sounds the best.
If you are messing with cap type, I hope you have everything else dialed in. Pot values (measured to the value), cap value (with precision), wiring style (50’s vs modern), pickup height, even strings and picks. There’s a ton of variability there, not to mention having your pedals and amps dialed in as well before you get to capacitor construction.
Yes. But it should be mentioned that not all onboard passive tone controls are the typical type, which is a treble reduction control. Passive bass controls are becoming more common. In those, the extra low end that is filtered out is dissipated as heat, while the part that is not filtered out passes through the cap.
This is not to say that cap type matters in these circuits. It's just to say that all passive toe controls don't work the same way. Only the standard type works the way you described.
The common tone control that Darg is referring to is passive. Not familiar with the type you are referring to.
^ That one shows lines in subtly different places....when they are superimposed. So actually its saying there are differences (if the graphs are accurately drawn). But such differences are minor ones that may well not be at all observable in all/any case.