When I got mini-beep.iso installed, I pressed and held down the left shift key until the disk stopped then typed in the boot up parameters. I didn't hear any extra beep telling me to key in boot up parameters either but it did work the first time with no problems. Perhaps adjust stuff so even if the left shift key is held down the beep still happens and maybe change the frequency of the boot up beep so it can't be confused with normal speaker beeps.
