The SGT-DI® Blue Line Anniversary Edition preamp and DI is identical to the silver SGT-DI but it’s blue! The same blue as the original 1969 “Blue Line” SVT® amplifier. It features a Super Grit Technology™ overdrive circuit, a 3-band EQ, Ultra-Hi and Ultra-Lo switches, a  ariable 10:1 compressor, and an IR Loader/Cab Simulator. Plus, it comes with the 75th  nniversary Free IR Pack IR that includes the SVT-610HLF, SVT-810AV, and SVT-15E cabs,  hich can be loaded using the free Ampeg IR Loader application.