So I figured out why those tone switch positions sounded so bad. On a whim, I tried plugging into the amp from the 300mV output. According to Stefan, who sold me the new pluckers, the 100mV output is only for the CP amplifier, and the reason for the poor sound from the tone switch is because that output is meant to interact with the CP amplifier in a certain way. Either way, I will stay away from that output from now on! Now I have three nice and subtly different tone filters to choose from. Still no luck on the vibrato though, but that's OK.