After tinkling with the program awhile, I devised
THE RAMALAM METHOD.

(My gift to you.)

1. Go to your first track, right click, choose "Specific VSTi /DXi Synth for MIDI Track."

2. Make your choice from the list.

3. Go to your next track, right click, choose "Specific VSTi/ DXi Synth for MIDI Track."

4. Instead of choosing the same instrument from the list, PRETEND YOU DON'T SEE IT.

5. Select "Add VSTi Plugin . . ."

6. Choose the same VSTi from the folder where you normally store your plugins.

7. The instrument will now be added as an fx, but will play on a different port.