Analogue-sequencer

....was on the box last night, south bank show.
I didn't record it, but I will if it's repeated.

it made me think, though, about how one might achieve reich's
"phasing" effect using a step sequencer. by "phasing", he usually
means two similar patterns (rhythms, tonal phrases, whatever) starting
off in sync & gradually drifting out, with one or the other pulling
ahead by fractions of a beat until they eventually land in sync again,
but out-of-step with each other. 
now, I reckon you could do something like this with a p3 by slowly
modulating the note-on delay of a copy of a track, which is also
playing undelayed. has anyone tried this? is the resolution fine enough?

d.