in halo 3, do I have to mod my xbox 360 to fire many rocket launchers or...

[Fgcgft D]

...is there a glitch? for halo 3, is it necessary for me to mod my xbox 360 to fire many rocket launchers or do granade tricks or is there a glitch I can simply use to do cool stuff during multiplayer?

and if you know how to do it without modding, please tell me!

for example, I want to do the things like in these videos:
http://youtube.com/watch?v=KQRuUFxVvFI&feature=related

 

[Txlady]

1. Go to: "Research your answer" on your question page. 2. Type in: Halo3/How do I fire mini rocket launchers? 3. Go to: #2.

 

[Gamertag_Justin says hi]

fire multiple rockets?? press the trigger fast.......

 

[Funny Girl]

if you go to forge you can edit the maps and put rockets all over but if your just playing in multiplayer and all the noobs use it, its a glitch