Tech 21 makes the RBI and one other i believe. what is the differance between the two? i play in a blues/rock band and would run it with a QSC power amp and an avatar 2x10 for now, and add a 2x12 later. Does one have better tone shaping than the other? better overdrive? im kinda lost on these sansamps. i know i used my buddys DI box and ran it into my pre amp in on my peavey head. and i really dug the bass it made.