diff --git a/Fonderie/fonderie.c b/Fonderie/fonderie.c
index c3a52b22..84a94db1 100644
--- a/Fonderie/fonderie.c
+++ b/Fonderie/fonderie.c
@@ -60,10 +60,9 @@ puts("");
 return 0;
 }
 /* -------------------------------------------------------------- */
-#define BLANK	50
 
 int demarre_la_machine(char *pattern, char *outdir, int szfifo,
-				int infx, int outfx, int step)
+				int infx, int outfx, int step, int blk)
 {
 int			foo, idx, width, height;
 glob_t			globbuf;
@@ -118,7 +117,7 @@ foo = create_fifo(szfifo, width, height, FIMG_TYPE_RGB);
 fprintf(stderr, "init fifo (%d slots) --> %d\n", szfifo, foo);
 
 /* XXX inject a few strange pics in the fifo */
-insert_blank(&input, BLANK, outfx, maxvalue, outdir);
+insert_blank(&input, blk, outfx, maxvalue, outdir);
 
 for (idx=0; idx<globbuf.gl_pathc; idx++) {
 	cptr = globbuf.gl_pathv[idx];
@@ -145,7 +144,7 @@ for (idx=0; idx<globbuf.gl_pathc; idx++) {
 	}
 fputs("\n", stderr);
 
-insert_blank(&input, BLANK*2, outfx, maxvalue, outdir);
+insert_blank(&input, blk, outfx, maxvalue, outdir);
 
 /*
  *		PLEASE, FLUSH THE FIFO !
@@ -186,14 +185,16 @@ char		*out_dir = "p8";
 int		in_effect = 0;
 int		out_effect = 0;
 int		steps = 1;
+int		blanks = 20;
 
 fprintf(stderr, "*** %s :\n\tcompiled by tTh, %s %s\n\tpid %d\n",
 			argv[0], __DATE__, __TIME__, getpid());
 fimg_print_version(2);
 
-while ((opt = getopt(argc, argv, "ghI:O:s:T:vw:x:")) != -1) {
+while ((opt = getopt(argc, argv, "B:ghI:O:s:T:vw:x:")) != -1) {
 	switch(opt) {
-
+		case 'B':	blanks = atoi(optarg);
+				break;
 		case 'g':	convert_to_gray = 1;
 				break;
 		case 'h':	help();	
@@ -221,7 +222,7 @@ if (verbosity) {
 	}
 
 foo = demarre_la_machine(in_pattern, out_dir, fifosize, in_effect,
-					out_effect, steps);
+					out_effect, steps, blanks);
 fprintf(stderr, "retour du big-run de la machine -> %d\n", foo);
 
 return 0;
diff --git a/Fonderie/sfx.c b/Fonderie/sfx.c
index af141520..fe6b75d3 100644
--- a/Fonderie/sfx.c
+++ b/Fonderie/sfx.c
@@ -80,19 +80,19 @@ for (foo=0; foo<size; foo++) {
 	if (fptr[foo] < mRa || fptr[foo] > mRb)
 		fptr[foo] = 0.0;
 	else
-		fptr[foo] = VAL;
+		fptr[foo] = mm[1];
 
 	fptr = pimg->G;
 	if (fptr[foo] < mGa || fptr[foo] > mGb)
 		fptr[foo] = 0.0;
 	else
-		fptr[foo] = VAL;
+		fptr[foo] = mm[3];
 
 	fptr = pimg->B;
 	if (fptr[foo] < mBa || fptr[foo] > mBb)
 		fptr[foo] = 0.0;
 	else
-		fptr[foo] = VAL;
+		fptr[foo] = mm[5];
 
 	}