Analogue-sequencer

I've owned my P3 for about 18 months now, but am only starting to get 
into the D accumulator.  The song I'm working on right now has me 
skipping across cables to mute tracks, falling on delays, splitting my 
skull to switch parts... for a fairly simple tune.

So I've figured out how to configure an Aux event (on Aux B) to unmute 
a track which I'm pretty sure I already knew how to do.  I'd like to 
unmute the track after pattern 1, track 1, plays 12 times.  

So I set up Aux D with the event to unmask Aux B when n > AccD.  But 
there is no difference from when xD <= n. I set the number on the Aux = 
12, enable the aux event.  Every time I hit run, track 3 is unmuted.

I'm missing something very nooby, but I can't figure out what it is.  
AuxB (unmuting the track) happens on the every retrigger of pattern 1.  

Thoughts?

cheers,
eric f