The original poster is changing the Multi on the Blofeld using MIDI Bank Change and Program Change commands from another instrument such as a sequencer.
If you want to do this, you need to have an instrument that can send the two MIDI messages. I don’t have a Radias, but I guess that it can do this if you map one controller (maybe a button or a knob) to CC #0 and make it send value 127. The you should probably change the Program on the Radias to the value that you want in order to send a Program Change message to the Blofeld.