hello all i'll be doing some overdubs soon with my boogie 400+. id like to record it at a quieter volume than i use for gigs. i know in some fender amps you can pull outside tubes in pairs to bring down the wattage. can you do that trick with a 400+? id even pull all but 2 if i could, id like to get it at the lowest volume possible. i need it playing thru a cab though, no DI sounds allowed! (im not really playing bass, it's fender VI bass with fuzz and all this guitar-y stuff) i swear ive seen pics here of people installing switches on their 400+'s that turned off pairs of tubes to get this happening. searching hasnt turned up much thanks!