is it possible to create a midi step sequencer, just like the performer in native instruments massive?

i already build a m4l patch where performer modulates the amplitude of osc1, then scales the db to a range of 0. 1. to modulate any plugin parameter inside live.. but thats still not the real deal...

do i have to use java and all that .json stuff i dont know nothing about?

could you guys get me started?

thanks

david