killing sounds ???????

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you all know in halo you get, killing spree for 5kills, running roit for 10 kills, would it be possible able to add to more??

for example rampage (same sound from halo 2) for 15 kills (says "in the zone") , baiscally all the same kill calls, berserker (says "untouchable"), overkill (says "un freaken beleivable") and all the multikill calls, Kill Frenzy, Killtrocity and Killamanjaro

anybody know if it would be possible ????? if so how