There are 2 Bank Select messages:
Bank Select MSB (Most Significant Byte) = MIDI Controller 0
Bank Select LSB (Least Significant Byte) = MIDI Controller 32
The banks are selected by preceding the Program Change message with a Control Change message which specifies a new value for Controller 0 and Controller 32.
You can insert both the Bank Select controller and Program Change messages from the MISI list editor.
Since the MIDI specification does not describe the manner in which a synthesizer’s banks are to be mapped to Bank Select messages, there is no standard way for a Bank Select message to select a specific bank. You need to check the manual for the Stage 2 to see what Bank Select values you need to send to select banks A to D.