To open the 'Drum Kits Editing' window, you can click on the DRUM KIT button.

Or you can click on the Tone numbers marked with a brown color. Brown buttons on the Channel toolbar represent the drum kits that are assigned to the Parts.

The "Drum Kit Edit" window allows you to change and adjust the main four parameters of drum sounds in the drum kit: pitch, level, pan and reverb. To select a parameter for editing, click on the parameter list:

RESET button will reset value of selected parameter all twelve drum sounds.

Since DRUM KIT EDIT displays controls for twelve sounds at a time, you can use "Octave" buttons to browse through the whole kit.

Whenever you move your mouse over drum note labels the name of the drum sample is displayed.