These are built into Vegas and are accessed by clicking the green Track FX icon in the Track Header.

Doing this brings up the basic audio FX window.
Click on the Track EQ icon and adjust as desired.

If that’s not enough, click on the Plug-In Chain icon on the upper left. This brings up yet another window of FX and you can add either the Paragraphic or Parametric EQ controls (also stock with all versions of Vegas).
