In the Equalizers / Bands panel, you can double-click a Band Frequency value and type in a value OR click on a mini-keyboard to select the frequency for a particular note.
Also, if you right-click a node in the EQ graph area, the Band Settings window is displayed. I was going to request the ability to select the frequency there by selecting a note too. But then I double-clicked the Frequency value and up popped the value editor, with the mini-keyboard.
