[jitter] autoload jit.matrixset

Hi,
I try to automatically load a full folder of image in a [jit.matrixset] object.
After the folder's content is loaded in a ubumenu, I bang it with an [uzi].
The problem is it seems the uzi is too fast to allow [jit.matrixset] to load images in ram.
So is there a better (probably!!) way to achieve this auto-loading ?
Here's my bad solution. thank you.

max v2;
#N vpatcher 10 59 713 760;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P comment 363 138 14 196617 2;
#P comment 231 129 14 196617 1;
#P comment 76 130 140 196617 you have to do it in 2 times :;
#P message 122 177 33 196617 clear;
#P button 296 89 15 0;
#P newex 296 106 27 196617 b 2;
#P newex 393 198 27 196617 - 1;
#P button 363 154 15 0;
#P newex 363 178 40 196617 uzi 12;
#P newex 202 303 129 196617 jit.matrix 4 char 640 480;
#P message 431 398 33 196617 set 0;
#P number 382 441 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P newex 202 278 40 196617 t b s b;
#P button 233 147 15 0;
#N vpatcher 257 191 857 591;
#P outlet 74 80 15 0;
#P inlet 69 36 15 0;
#P connect 0 0 1 0;
#P pop;
#P newobj 363 366 13 196617 p;
#P newex 395 392 27 196617 - 1;
#P message 331 442 45 196617 index \$1;
#N counter 0 0 14;
#X flags 0 0;
#P newobj 331 420 75 196617 counter 0 0 14;
#P message 313 393 78 196617 matrixcount \$1;
#P number 526 439 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P user jit.pwindow 312 550 82 62 0 1 0 0 1 0;
#P message 526 457 84 196617 outputmatrix \$1;
#N vpatcher 20 74 420 304;
#P window setfont "Sans Serif" 14.;
#P newex 50 56 117 196622 opendialog fold;
#P message 171 84 116 196622 autopopulate 1;
#P newex 50 82 114 196622 prepend prefix;
#P inlet 50 30 15 0;
#P outlet 50 116 15 0;
#P connect 1 0 4 0;
#P connect 4 0 2 0;
#P fasten 3 0 0 0 176 111 55 111;
#P connect 2 0 0 0;
#P fasten 1 0 3 0 55 49 176 49;
#P pop;
#P newobj 233 169 92 196617 p charger_dossier;
#P number 363 274 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P newex 363 254 72 196617 route populate;
#P user ubumenu 233 233 100 196617 0 1 1 0;
#X prefix_set 0 1 kyred:/Users/derrickgiscloux/Pictures/famille/noelie/ 0;
#P newex 204 257 105 196617 prepend importmovie;
#P newex 313 512 158 196617 jit.matrixset 68 4 char 640 480;
#P comment 314 90 99 196617 image folder to load;
#P comment 271 65 117 196617 this bang doesn't do it !!;
#P connect 3 0 17 0;
#P connect 17 0 20 0;
#P connect 17 1 20 0;
#P fasten 4 1 3 0 283 251 209 251;
#P connect 16 0 7 0;
#P connect 24 1 7 0;
#P connect 26 0 4 0;
#P connect 7 0 4 0;
#P fasten 23 0 4 0 398 224 238 224;
#P connect 25 0 24 0;
#P fasten 15 0 11 0 368 388 318 388;
#P fasten 8 0 2 0 531 505 318 505;
#P connect 13 0 2 0;
#P connect 11 0 2 0;
#P connect 20 0 2 0;
#P connect 2 0 9 0;
#P fasten 19 0 12 0 436 416 336 416;
#P connect 17 2 12 0;
#P connect 12 0 13 0;
#P connect 22 0 21 0;
#P connect 24 0 21 0;
#P fasten 4 2 5 0 328 251 368 251;
#P connect 5 0 6 0;
#P connect 6 0 15 0;
#P fasten 12 0 18 0 336 439 387 439;
#P fasten 6 0 21 1 368 316 464 316 464 159 398 159;
#P connect 21 2 23 0;
#P fasten 15 0 14 0 368 388 400 388;
#P connect 14 0 12 4;
#P connect 16 0 19 0;
#P connect 10 0 8 0;
#P pop;