i tried to find examples of the Synth in any of the Helix products. there's a 3 note generator it seems, but i don't see anything about it tracking full chords being played into it. i'd imagine there'd be at least ONE video out there showing it, but i haven't found anything.
listening on better speakers, the rhythm part sounds like octave up shifts heavily compressed. not a synth. still could be wrong.
but i think she was only showing of the Synth for the lead part.
regardless, to get that sort of chord tracking you'd need a hex pickup from the guitar, so all 6 strings' data go into the guitar synth.