PD help

[Marc Nostromo [M-.-n]]

I'm trying to do some basic stuff in Pd and it turns hairy. Right now I'm
recieving a continuous signal that I restrict to 0 and 1's so my stream now
looks like

00000111100010010011111100000000

I would like to send a midi note on only when there's a change 0->1 & 1->0.
Any idea on how to achieve that ?

/M
-- 
http://nostromo.noisepages.com
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