Hi. I have a number of guitar pedals which appear to have faulty and/or noisy pots. I have been looking at one in particular which, in live use, displays the symptoms "off or on full" with only 100% increase available. I have taken the pot apart and what I can see of the carbon (?) track appears to be in good condition yet when I place a multi meter at any two separate points on the track, I appear to have no circuit when I'd expect to have one. Is this a valid test that, if conducted at various points and distances on the track, proves that the track itself is operational (I am at the beginner end of the electronics scale) and, if so, can anyone offer any suggestions as to how to resolve the problem or a way to establish that the pot needs to be replaced.
Thanks in advance.