diff --git a/Fonderie/crapulator.c b/Fonderie/crapulator.c
index 71fd9dd..531a0aa 100644
--- a/Fonderie/crapulator.c
+++ b/Fonderie/crapulator.c
@@ -165,6 +165,7 @@ switch (idFx) {
 		break;
 	case 12:
 		retval = fimg_lissage_2x2(image);
+		(void)fimg_killborders(image);
 		break;
 	case 13:
 		retval = insitu_filtre3x3(image);
@@ -176,6 +177,12 @@ switch (idFx) {
 		retval = kill_a_few_lines(image, fval,
 						image->height/20);
 		break;
+	case 16:
+		retval = bouger_les_pixels(image, 6);
+		break;
+	case 17:
+		retval = mirror_split(image, 0);
+		break;
 
 	/* here are the glitches */
 	case 24:			/* experiment ! */
diff --git a/Fonderie/filterstack.c b/Fonderie/filterstack.c
index 11d6c47..116c24a 100644
--- a/Fonderie/filterstack.c
+++ b/Fonderie/filterstack.c
@@ -17,107 +17,105 @@
 
 extern int		verbosity;
 
-static	FilterSlot 	*stack_slots;
-static  int		nbre_filters, idx_slot;
-/* -------------------------------------------------------------- */
-int filterstack_init(int nbre)
-{
-FilterSlot	*fsptr;
+static	FilterStack 	f_stacks[NUMBER_OF_STACK];
 
+/* -------------------------------------------------------------- */
+int filterstack_init(int numid, int nbre)
+{
 #if DEBUG_LEVEL
-fprintf(stderr, ">>> %s ( %d )\n", __func__, nbre);
+fprintf(stderr, ">>> %s ( %d %d )\n", __func__, numid, nbre);
 #endif
 
-if (NULL != stack_slots) {
-	fprintf(stderr, "ERR stack_slots = %p\n",stack_slots);
-	return -1;
-	} 
-fsptr = calloc(nbre, sizeof(FilterSlot));
-if (NULL == fsptr) {
-	fprintf(stderr, "%s : no memory\n", __func__);
+if (numid < 0 || numid > NUMBER_OF_STACK) {
+	fprintf(stderr, "%s: slot number %d invalid\n", __func__, numid);
 	exit(1);
 	}
 
-stack_slots = fsptr;
-nbre_filters = nbre;
-idx_slot = 0;
-
-fprintf(stderr, "%s: stack at %p\n", __func__, stack_slots); 
+memset(&f_stacks[numid], 0, sizeof(FilterSlot));
 
 return 0;
 }
 /* -------------------------------------------------------------- */
-int filterstack_add(int code, int ival, float fval)
+int filterstack_add(int numid, int code, int ival, float fval)
 {
+int		idxsl;
 #if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( %d %d %f )\n", __func__, code, ival, fval);
 #endif
 
-if (NULL==stack_slots) {
-	fprintf(stderr, "%s: NULL statck !\n", __func__);
+if (numid < 0 || numid > NUMBER_OF_STACK) {
+	fprintf(stderr, "%s: slot number %d invalid\n", __func__, numid);
 	exit(1);
 	}
-if (idx_slot == nbre_filters) {
+
+if (f_stacks[numid].count == FILTER_BY_STACK) {
 	fprintf(stderr, "%s: stack is full\n", __func__);
 	return -1;
 	}
 
-stack_slots[idx_slot].numero = code;
-stack_slots[idx_slot].ival   = ival;
-stack_slots[idx_slot].fval   = fval;
+idxsl = f_stacks[numid].count;			/* aliasing */
 
-idx_slot++;
+f_stacks[numid].slots[idxsl].numero = code;
+f_stacks[numid].slots[idxsl].ival   = ival;
+f_stacks[numid].slots[idxsl].fval   = fval;
+
+f_stacks[numid].count++;
 
 return 0;
 }
 /* -------------------------------------------------------------- */
-int filterstack_list(const char *txt)
+int filterstack_list(int numid, const char *txt)
 {
 int		idx;
 
-if (NULL==stack_slots) {
-	fprintf(stderr, "%s: NULL statck !\n", __func__);
+if (numid < 0 || numid > NUMBER_OF_STACK) {
+	fprintf(stderr, "%s: slot number %d invalid\n", __func__, numid);
 	exit(1);
 	}
 
-fprintf(stderr, "------- %-20s --------\n", txt);
-fprintf(stderr, "stack at %p, size %d, current %d\n",
-			stack_slots, nbre_filters, idx_slot); 
+fprintf(stderr, "--- %2d -- %-20s --------\n", numid, txt);
+// fprintf(stderr, "stack at %p, size %d, current %d\n",
+//			f_slots, nbre_filters, idx_slot); 
 fprintf(stderr, "idx     fx#   name          ival   fval\n");
-for (idx=0; idx<idx_slot; idx++) {
+
+for (idx=0; idx<f_stacks[numid].count; idx++) {
 
 	fprintf(stderr, "%3d    %3d    %-10s  %3d      %f\n", idx,
-			stack_slots[idx].numero,
-			crap_name_from_number(stack_slots[idx].numero),
-			stack_slots[idx].ival,
-			stack_slots[idx].fval);
+			f_stacks[numid].slots[idx].numero,
+	crap_name_from_number(f_stacks[numid].slots[idx].numero),
+			f_stacks[numid].slots[idx].ival,
+			f_stacks[numid].slots[idx].fval);
 
 	}
 
 return 0;
 }
 /* -------------------------------------------------------------- */
-int filterstack_run(FloatImg *target, int notused)
+int filterstack_run(int numid, FloatImg *target, int notused)
 {
-int		idx, foo;
+int		idx, foo, eff;
+float		fv;
 
 #if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( %p %d )\n", __func__, target, notused);
 #endif
 
-if (NULL==stack_slots) {
-	fprintf(stderr, "%s: NULL statck !\n", __func__);
+if (numid < 0 || numid > NUMBER_OF_STACK) {
+	fprintf(stderr, "%s: slot number %d invalid\n", __func__, numid);
 	exit(1);
 	}
 
-for (idx=0; idx<idx_slot; idx++) {
+for (idx=0; idx<f_stacks[numid].count; idx++) {
+
+	eff = f_stacks[numid].slots[idx].numero;
+	fv  = f_stacks[numid].slots[idx].fval;
 
 	if (verbosity > 1)
 		fprintf(stderr, "%d : effect %2d on %p\n",
-				idx, stack_slots[idx].numero, target);
+				idx, eff, target);
+
+	foo = crapulator(target, eff, fv);
 
-	foo = crapulator(target, stack_slots[idx].numero,
-				 stack_slots[idx].fval);
 	if (foo) {
 		fprintf(stderr, "crapulator error %d\n", foo);
 		return foo;
@@ -127,7 +125,7 @@ for (idx=0; idx<idx_slot; idx++) {
 return 0;
 }
 /* -------------------------------------------------------------- */
-int load_stack_from_file(char *fname, int notused)
+int load_stack_from_file(int numid, char *fname, int notused)
 {
 FILE		*fp;
 // int		a, b;
@@ -138,8 +136,8 @@ FILE		*fp;
 fprintf(stderr, ">>> %s ( '%s' %d )\n", __func__, fname, notused);
 #endif
 
-if (NULL==stack_slots) {
-	fprintf(stderr, "%s: NULL statck !\n", __func__);
+if (numid < 0 || numid > NUMBER_OF_STACK) {
+	fprintf(stderr, "%s: slot number %d invalid\n", __func__, numid);
 	exit(1);
 	}
 
@@ -151,8 +149,6 @@ if (NULL==(fp=fopen(fname, "r"))) {
 /*
  *		here was dragons
  */
-
-
 		/* hadoc parser ? */
 
 fclose(fp);
@@ -160,14 +156,19 @@ fclose(fp);
 return -1;
 }
 /* -------------------------------------------------------------- */
-int parse_filter_chain(const char *argument)
+int parse_filter_chain(int numid, char *argument)
 {
 char		*cptr;
 int		value, foo;
 
+if (numid < 0 || numid > NUMBER_OF_STACK) {
+	fprintf(stderr, "%s: slot number %d invalid\n", __func__, numid);
+	exit(1);
+	}
+
 fprintf(stderr, "\n%s: arg = '%s'\n", __func__, argument);
 
-foo = filterstack_init(8);
+foo = filterstack_init(numid, 8);
 if (foo) {
 	fprintf(stderr, "%s: filterstack init --> %d\n", __func__, foo);
 	return foo;
@@ -180,7 +181,7 @@ for (;;) {
 	argument = NULL;
 	// fprintf(stderr, "  parsing '%s'\n", cptr);
 	if (1 == sscanf(cptr, "%d", &value)) {
-		foo = filterstack_add(value, 1, 1.0);
+		foo = filterstack_add(numid, value, 1, 1.0);
 		if (foo) {
 			fprintf(stderr, "%s: err %d add\n",
 					__func__, foo);
@@ -188,7 +189,7 @@ for (;;) {
 		}
 	}
 
-if (verbosity) filterstack_list(__func__);
+if (verbosity) filterstack_list(numid, __func__);
 return 0;
 }
 /* ----------------------------------------------------------- */
diff --git a/Fonderie/filterstack.h b/Fonderie/filterstack.h
index 18cb7d7..bc787c2 100644
--- a/Fonderie/filterstack.h
+++ b/Fonderie/filterstack.h
@@ -8,16 +8,23 @@ typedef struct {
 	float	fval;
 	} FilterSlot;
 
+#define NUMBER_OF_STACK		8
+#define FILTER_BY_STACK		8
 
-int filterstack_init(int nbre);
+typedef struct {
+	int		count;
+	FilterSlot	slots[FILTER_BY_STACK];
+	} FilterStack;
 
-int filterstack_add(int code, int ival, float fval);
+int filterstack_init(int numid, int nbre);
 
-int filterstack_list(const char *txt);	/* XXX */
+int filterstack_add(int numid, int code, int ival, float fval);
 
-int filterstack_run(FloatImg *target, int notused);
+int filterstack_list(int numid, const char *txt);	/* XXX */
 
-int load_stack_from_file(char *fname, int notused);
+int filterstack_run(int numid, FloatImg *target, int notused);
 
-int parse_filter_chain(const char *argument);
+int load_stack_from_file(int numid, char *fname, int notused);
+
+int parse_filter_chain(int numid, char *argument);
 
diff --git a/Fonderie/fonderie.c b/Fonderie/fonderie.c
index c6cdb28..bbc815e 100644
--- a/Fonderie/fonderie.c
+++ b/Fonderie/fonderie.c
@@ -81,7 +81,7 @@ if (1 != step) fprintf(stderr, "\tstep is %d\n", step);
 
 (void)fimg_timer_set(0);
 
-if (infx)		fprintf(stderr, "\tin fx  #%d\n", infx);
+if (infx)		fprintf(stderr, "\tin  fx  #%d\n", infx);
 else			fprintf(stderr, "\tno in fx\n");
 if (outfx)		fprintf(stderr, "\tout fx  #%d\n", outfx);
 else			fprintf(stderr, "\tno out fx\n");
diff --git a/Fonderie/glitches.c b/Fonderie/glitches.c
index 273d70b..21bc8a1 100644
--- a/Fonderie/glitches.c
+++ b/Fonderie/glitches.c
@@ -120,7 +120,7 @@ return -1;
 /*
  *   used by vertical_singlitch()
  */
-int x_delta(float dy, float phy)
+static int x_delta(float dy, float phy)
 {
 float	param, fv;
 param = dy + phy;
diff --git a/Fonderie/interpolator.c b/Fonderie/interpolator.c
index 30d53bd..4abc944 100644
--- a/Fonderie/interpolator.c
+++ b/Fonderie/interpolator.c
@@ -181,7 +181,7 @@ for (idx=0; idx<globbuf.gl_pathc; idx++) {
 		//	exit(1);
 		//	}
 
-		foo = filterstack_run(&Out, 0);
+		foo = filterstack_run(0, &Out, 0);
 		if (foo) {
 			fprintf(stderr, "run filt stk--> %d\n", foo);
 			return foo;
@@ -269,7 +269,7 @@ if (3 != (argc-optind)) {
 	exit(1);
 	}
 
-foo = parse_filter_chain(filterchain);
+foo = parse_filter_chain(0, filterchain);
 if (foo) {
 	fprintf(stderr, "err %d parsing '%s'\n", foo, filterchain);
 	exit(1);
diff --git a/Fonderie/metriques.c b/Fonderie/metriques.c
index c83eab2..320902c 100644
--- a/Fonderie/metriques.c
+++ b/Fonderie/metriques.c
@@ -59,7 +59,20 @@ if (foo) {
 	return foo;
 	}
 fval = -1.0;				/* sensible default value */
-foo = get_float_metric_b(&image, &fval);
+switch (mode) {
+	case 1:
+		foo = get_float_metric_a(&image, &fval);
+		break;
+	case 2:
+		foo = get_float_metric_b(&image, &fval);
+		break;
+	default:
+		fprintf(stderr, "%s: method %d invalid\n", 
+				__func__, mode);
+		exit(1);
+		break;		/* not reached */
+	}
+
 *where = fval;
 
 fimg_destroy(&image);
diff --git a/Fonderie/sfx.c b/Fonderie/sfx.c
index 0d49249..d201536 100644
--- a/Fonderie/sfx.c
+++ b/Fonderie/sfx.c
@@ -18,6 +18,63 @@
  */
 extern	int		verbosity;
 
+/* -------------------------------------------------------------- */
+/* nouveau du 9 decembre 2020, en ecoutant le Fermion raconter du
+   superbe portnawak  */
+int bouger_les_pixels(FloatImg *pimg, int intensite)
+{
+int		x, y, nx, ny;
+float		rgb[3];
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pimg, intensite);
+#endif
+
+if (intensite < 1) {
+	fprintf(stderr, "%s: %d bad intensity\n", __func__, intensite);
+	return -1;
+	}
+
+for (x=0; x<pimg->width; x++) {
+	for (y=0; y<pimg->height; y++) {
+
+	    nx = x+(rand()%intensite)-(intensite/2);
+            ny = y+(rand()%intensite)-(intensite/2);
+
+	    if ( nx<0 || ny<0 || nx>=pimg->width
+                              || ny>=pimg->height )
+					continue;
+
+	    fimg_get_rgb(pimg, nx, ny, rgb);
+	    fimg_put_rgb(pimg,  x,  y, rgb);
+
+	    }
+	}
+
+return 0;
+}
+/* -------------------------------------------------------------- */
+/* nouveau du 9 decembre 2020, en ecoutant les Cernettes */
+int mirror_split(FloatImg *pimg, int kaboo)
+{
+int		line, x, xs, xd;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pimg, kaboo);
+#endif
+
+for (line=0; line<pimg->height; line++) {
+	for (x=0; x<pimg->width/2; x++) {
+		xs = (pimg->width * line) + x;
+		xd = (pimg->width * line) + (pimg->width -x);
+		pimg->R[xd] = pimg->R[xs];
+		pimg->G[xd] = pimg->G[xs];
+		pimg->B[xd] = pimg->B[xs];
+		}
+	}
+
+return 0;
+}
 /* -------------------------------------------------------------- */
 /* nouveau du 20 novembre 2020, pour encoder une vidz du vernissage
  * du festival Sauvageonnes de Mixart-Myrys					 */
diff --git a/Fonderie/sfx.h b/Fonderie/sfx.h
index 9e14405..e54c911 100644
--- a/Fonderie/sfx.h
+++ b/Fonderie/sfx.h
@@ -3,6 +3,10 @@
  */
 
 
+int bouger_les_pixels(FloatImg *pimg, int kaboo);
+
+int mirror_split(FloatImg *pimg, int kaboo);
+
 int des_bords_sombres_a(FloatImg *pimg, int offset);
 
 int trinarize(FloatImg *pimg, int notused);	// in sfx.c
diff --git a/Fonderie/t.c b/Fonderie/t.c
index f44824c..fd222c1 100644
--- a/Fonderie/t.c
+++ b/Fonderie/t.c
@@ -23,6 +23,8 @@ int		convert_to_gray;	/* WTF ? */
 #define		LMAX	255.0
 #define		TIMER	1
 
+#define		STK	0
+
 /* ----------------------------------------------------------- */
 
 int essai_filterstack(char *fname)
@@ -31,7 +33,7 @@ int		foo;
 FloatImg	image;
 double		debut, fin;
 
-filterstack_list(__func__);
+filterstack_list(STK, __func__);
 
 foo = fimg_create_from_dump(fname, &image);
 if (foo) {
@@ -43,7 +45,7 @@ srand(getpid()); srand48(getpid());
 
 debut = fimg_timer_set(TIMER);
 
-foo = filterstack_run(&image, 0);
+foo = filterstack_run(STK, &image, 0);
 if (foo) {
 	fprintf(stderr, "filterstack run --> %d\n", foo);
 	return foo;
@@ -92,7 +94,7 @@ while ((opt = getopt(argc, argv, "hF:v")) != -1) {
 fprintf(stderr, "%s : argc = %d, optind = %d\n", argv[0], argc, optind);
 #endif
 
-foo = parse_filter_chain(filterchain);
+foo = parse_filter_chain(STK, filterchain);
 if (foo) {
 	fprintf(stderr, "err %d in parse_filter_chain\n", foo);
 	exit(1);