From listening to the vid, the turn-off for me is the output drop of the Treble, Bass and Wild Dog settings. Or if you look at it differently, the over-boost of output at the Contra Bass setting. If each setting was meant to be useable while performing, they should all have equal output and vary only considering their tone setting. So, Wild Dog = odd phase tone, Bass = lower, Treble = brighter, and Contra Bass = darker/woodier? The Contra Bass setting could be considered a "bass boost" but if you had the gain set for the other 3, a switch to Contra Bass mid-song could blow the speaker.
As much as I love Phil Kubicki's Ex-Factor preamp - I never use the passive settings because of the major output drop from the 2 active settings. He even has mention of it in his pamphlet on the bass - in it he cautions against mid-song switching from passive to active for that same reason. (surge of output/damaging speakers) I compare it to another of my favorite active/passive pre-amps, the G&L L2000. All setting are consistently gauged in output, with only a slight rise engaging the 'boost' setting. Active to passive stays at a similar output/volume - just alters the tone accordingly. I've switched between active to passive, and active to boost on the fly with no major output surge problems.