The UDE uses a font hack, not an audio hack. But before you shit yourself from the word font hack, let me explain.
The UDE is the safest exploit to date, it does not suffer from the clock loop like other font hacks and is extremely easy to install, doesn't corrupt, is reliable and most certainly one of the greatest acheivements in xbox modding history. If you look for ldots memory card installer for UDE/UDE2, (you want UDE not UDE2 if your xbox lets you use an audio hack), all you do is boot the hack from an exploitabe game and it has its own handy installer and backup options and such, then next time you boot you will go to whichever dashboard you chose to install (you have th choice between MXM and Evox, i personally prefer the first, has more features than Evox). Anyway when you want to uninstall the hack, you just boot with the tray open and there is an option to uninstall.
BUT, before the install make sure you have fully deleted the audio hack and all changes it has made to the hard drive, I am not experienced in audio hacks so i don't know what you will have to do, also it is absolutely necessary that your box does not lose power during installation or you are screwed.
I think i explained most things, but go to the XBE exploit forums for more help.