For those that haven't tried it or would like to know,  you can tie the Korg SQ-1 nicely into the Mono/Poly.

You can use it to feed the VCF  FcM IN & VCO FM IN as well as the main CV input and of course the Arpeggio Trigger Input

It also works in conjunction with the other internal controls to let you do a lot more.... like providing the missing Sequencer.