volume control treble loss

ErnieM said:

While completely admitting I am new to this party and have never even picked up an electric guitar... The whole issue of treble loss due to the cord length would disappear by just having a lower input impedance on the amplifier.

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No.
I posted a graph that showed the inductance of the pickup resonating with the capacitance of the cable which makes a peak at about 4kHz. The graph shows that a low amplifier impedance damps the peak and attenuates the entire signal level and attenuates the high frequencies more which you do not want.