You would need to send Shape CC number 17 to the model cycles and plock different values on the steps to change chord shape:
12.4 FLTR PAGE (CC VALUE)
Here you can set the values of up to eight assignable CC commands. The default value of the parameters
on this page is OFF, meaning they are disabled and will not send out any data. Press and hold [FUNC] and
then press the DATA ENTRY knobs to enable them. You can then use the DATA ENTRY knobs to set the
parameter values as usual. Disable the parameters again by repeating the enabling procedure.
Press [FLTR] to access this parameter page.