think of NICE..Deep. RICH..DARK notes. like a melted chocolate..oh yea:D. i would suggest doing long tones. it helps me get it all the time...and when you're doing long tones to get the c remember what you did with the position of your embrochure^_^
I thought flutter tounge thingy is all genetics. there's this one girl in my band who could do it..but me?...SRY i don't know how to Roll my rrrrrrr..thing..and the other method.umm..i don't get it^_^