Magix Help says:
Controller editor - Selecting and editing events
The controller editor is located below the piano roll and can be hidden.
It is opened either with a click on the button below the keyboard or via "Alt + V".

Alt + V just makes my computer go ding
I cant find the keyboard.

What I want to do is to send a MIDI message to select bank and patch on my
MIDI synth.  (Korg D5/RW)
To avoid latency I am sending my keyboard through the Korg and on to my
computer MIDI IN.  (The Korg has it's own dedicated amp and speakers)

Thank-you,

Russell