Yep I have heaps of customised effects set up different discs and use the step mod extensively on many of them. My faves are various v.synth configurations set up as filter banks with l.f.o modulation etc etc and ring mod of the pad input against a PWM wave with the step mod controling save LFO wave shape and variation of the amount of Pulsewidth of the wave thats ringmoded my the external input. I can also step sequence the 6 controllers assigned too knobs from my RS7000 which makes for some pretty insane effects options
. But yeah it's a great feature of the 808 I must say ....