??? The point of the attenuator is to get amp dirt/distortion at low volumes. If you want clean sound their isn't any reason to use one
The 2000s has a bright-capacitor across the volume pot. At low volume knob settings, there will be a treble emphasis. Another reason to use an attenuator would be able to turn the volume up higher for a less-trebly sound. But you could just as well turn down the level going INTO the amp (on your bass or, say, your last pedal in the chain), and crank the amp volume up higher. Or swap out the cap with a lower-value capacitor, or remove it entirely. But maybe you don't want to mod a vintage amp
for recording.