Tommy is correct about the assignment of the buttons. Out of the box,
those buttons are assigned to be a tap delay control for the unit that
is in FX slot 3. This should be a Stereo Delay and you can confirm by
pressing the EFFECTS button that is to the right of the screen. If you
would like to see how all of the Assign buttons are setup, press the
VIEW button that is located at the bottom right of the Assign section.
This will tell you what each rotary knob and button are assigned to.
If you have any questions on the X32, please feel free to send me a PM
or contact through the thread.
Specialist, Product Support