It is 8 separate polysynths
each triggerable by one or more of the notes that
are played on the keyboard.
The step sequencers, as well as
triggering notes can be used to affect filter cutoff
or sync sweep or FM on each synth.
Also unique to Kaskade (I think) is
a filter which can be varied continuously between Lo
band and Hi pass.
32 bit Windows VSTi
Krakli Kaskade is free.