If you select an audio clip on your timeline, you will find these adjustment options if you click on the Adjust button along the upper right side of the program.
Also for your consideration...are you in the Expert or Quick workspace of Premiere Elements 11?
To supplement what SG has written,
Expert workspace, selection including audio,
then the Adjustment Palette options will include:
But, if Quick workspace, selection including audio,
then the Adjustment Palette will include only:
There are several other instances where the Quick workspace will not have features/options available in Expert workspace.