Howto: best way to remove audio

Ok, so I need some help with something that seems like it should be extremely simple.  I have a video/audio clip and I need to replace the audio in 4 small sections of the larger clip.
Using the razor blade on the audio is how I am doing it now, but its so permanant (obviously) and I am afraid that if i clip too much and need to adjust in the future, I have to start all over.
I tried adjusting the audio level using key points but I couldnt get that to work.  It wants to lower the audio level gradually, whereas I need it to cut immediately.  Then come back up to normal level.
Please help.  There has to be a simpler way to do this without cutting up the audio clip into a dozen pieces.
Thanks,
//digital

If you do not need to do the Cuts, for the Video, you can just use Keyframes on the Audio, and can instantly drop the Volume over the course of one Frame (basically 1/30th sec.). Hint: when you go to add your Keyframes, zoom the view of the mini-Timeline way in, and set your Keyframe, then hit the cursor arrow key to advance 1 Frame, and set another Keyframe. Adjust this to the desired level of attenuation. If you are NOT zoomed in, the Keyframes will seem to be atop each other, and hard to get the cursor onto. Now, you can still use the Keyframe advance button, but it is so much easier to work in the zoomed in view, IMHO. No need to Cut the Audio.
You can still do it with the Cuts (just do it for the Audio Track - Target it), and then in the "pieces" that you wish to attenuate, drag the yellow-orange "rubberband" way down in that segment of the Clip. Hint: Show Volume Keyframes will need to be set in the Audio Track Header (should be by default).
Good luck,
Hunt

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