well the manual is always the way
"For the ultimate in genuine Moog polyphony, try connecting several Voyagers together,
or a combination of Voyagers and Little Phatty synthesizers. For more information on
polyphony connection options, see the MIDI KEY ORDER function on page 65."
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MIDI KEY ORDER allows multiple Voyagers to function together as a
polyphonic synth when controlled by an external MIDI device. Up to 16
Voyagers can be linked together to create a 16-voice synth. To define
the number of Voyagers in a polyphonic setup, set the MAXIMUM KEYS
parameter to the number of Voyagers in your setup, then configure each
Voyager for a different voice number using the ACTIVE KEY parameter.
For example, if you have 3 Voyagers in your setup, each should be set for
‘MAXIMUM KEYS: 3’, and the first Voyager should be set for ‘ACTIVE KEY:
1’, the second ‘ACTIVE KEY: 2’, and the third ‘ACTIVE KEY: 3’. Use the
CURSOR to select the MIDI Key Order parameters and use the -1/+1
buttons to select the values.
You can also use a combination of Voyager and Little Phatty synths in a
polyphonic