Curious about the apparent unusual operation of the tone control on my 1969 Gibson Eb-0. When turned from 10 down to 1 the tone gets progressively thinner and the output decreases. It seems that instead of rolling off highs it rolls off lows and volume. Not sure if this is normal or not seeing as how boomy and muddy these basses normally are. The other thing that has me thinking that this is normal is that the difference is very similar to what the "baritone" switch on my 1966 EB-2 does to the tone when activated. Anyone know if this is normal operation or do I have a problem? Have included pictures of the control cavity to show how it is wired up. As far as I know the controls and electronics are OE. Some strange looking units. Capacitors? Resistors? Inductors?