Options Page - Program Change

Cubase 8.0.2 Pro with Halion Sonic Se 2

Copied from the manual:

Controller Changes
Determines how HALion Sonic SE handles incoming MIDI Program change messages.
• In GM Mode, program change messages are used to switch programs
in the slots of the Multi Program Rack.
• In Multi Mode, program change messages are used to switch between
the 128 multis that can be configured on the Multi chain page.
• Set this to Off to ignore incoming controller change messages.

In the Halion Se 2 interface this option is listed as “Program Changes” with only 2 options: GM or OFF - NO MULTI MODE
There is no “Multi chain page.” - would this be the “Midi Page”?

Please explain how we can send Program Changes to Multi instruments from midi keyboards.

thank you
Paul