Can Slim Phattys be chained together and played polyphonically?

Yes! In the System Utilities menu, scroll until you see MIDI Setup. The seventh page of the MIDI Setup menu allows you to set up multiple Moog synths as a polyphonic synth stack. The settings are ‘POLY: OFF’ or ‘POLY: (#) of (##)’. The rst number represents which note this par- ticular SP is assigned to play, the second number sets the total number of available voices. 

For example, if you had an SP and a Little Phatty, you would set the Little Phatty to ‘POLY: 1 of 2’ and you would set the SP to ‘POLY: 2 of 2’. Connect the MIDI OUT from the Little Phatty to the MIDI IN on the SP. You should now be able to play duophonically, with the Little Phatty sounding the rst note played on the keyboard and the Slim Phatty sounding the second note. If all available voices are in use, additional notes will not sound until enough keys are released to free a voice. 

MIDI Continuous Control numbers (MIDI CC’s) are consistent between the Little Phatty and Slim Phatty, so any parameter changes such as pitch bend and mod wheel, lter cutoff and so on, should affect all voices simultaneously. 

(p.32 of the manual)