I'm more than a year late to this party it seems...
but this is a fun topic, and i love bass so much, ill add my own stuff for kicks and giggles
back in the day when i was singing bass ALL the time, i could get more of the lower stuff to sound fuller. look at me saying back in the day... im too young for that! :/ dont know how much 'vocal fry' or 'twang' im using to get this stuff. some clarification on that would be nice, that stuff confuses me. i dont think i would be considered a true bass... but thats not something i care much about
here it is, used E as DO: http://www.box.com/s/03hsxnpi92x1sqgtbsxm