change writings

I’m using AI 4, 4.5.2

In some places, in the writings of a track, there have appeared some unwanted sound peeks, (that I did not made).

The sound level of this particular track is also to high compared with the rest of the tracks.

My questions are:

  • Is it possible to change or cancel small parts of the writing? if so, how do you do that?

  • Is it possible to cancel all the writings in a track? (I have redone the writings but the sound peaks remane also in the new one)