So when you output an y, you also need to set a pair of [moses] so that it can find numbers outside of the interval y-c < x < y+c, or equivalently, abs(x-y) < c, where c is the minimum amount of change that you want to hear about.
I did it in with:
#N canvas 0 0 450 300 10;
#X obj 38 -73 delta;
#X obj 37 -50 abs;
#X obj 141 -72 sel 1;
#X obj 94 -96 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
-1;
#X obj 40 -100 change;
#X obj 94 -63 f;
#X obj 98 -30 outlet;
#X obj 40 -127 inlet;
#X obj 179 -126 inlet;
#X obj 141 -94 >= \$1;
#X connect 0 0 1 0;
#X connect 1 0 9 0;
#X connect 2 0 3 0;
#X connect 3 0 5 0;
#X connect 4 0 0 0;
#X connect 4 0 5 1;
#X connect 5 0 6 0;
#X connect 7 0 4 0;
#X connect 8 0 9 1;
#X connect 9 0 2 0;
is that what you meant?
salut
glerm