if you only adjust the start property (what was set by the preset) then it will work.
for example it may go from 0 to 5 for teh first 2 keyframes, then hold then start agagin later on from 5 to 13, hold, 13 to 27, etc…
i am making up the numbers but that will work.
and i think as steve said earlier, do an audio preview and tap out some markers using the * on the keypad. you can go back and label those if you like by doubel clickign them. he mentioned how you can scrub audio. the only other thing that might help is opening the waveform but selecting the layer that has your audio and hitting L twice ( or you can twirl down to it)