diff --git a/.gitignore b/.gitignore
index ad2c623..e4f21fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,4 +36,5 @@ ui/log.*
 ui/t
 
 Beep/alguabeep
+Beep/*.log
 
diff --git a/Beep/README.md b/Beep/README.md
new file mode 100644
index 0000000..cb8bcef
--- /dev/null
+++ b/Beep/README.md
@@ -0,0 +1,5 @@
+# AlguaBeep
+
+Une expérimentation hasardeuse pour traduire des images de webcam
+en sons qui déchirent les oreilles
+
diff --git a/Beep/alguabeep.c b/Beep/alguabeep.c
index 19f0f0c..d9f3088 100644
--- a/Beep/alguabeep.c
+++ b/Beep/alguabeep.c
@@ -109,6 +109,11 @@ while ((opt = getopt(argc, argv, "d:hIK:n:p:v")) != -1) {
 		case 'K':	K = atoi(optarg);		break;
 		case 'n':	nbre_capt = atoi(optarg);	break;
 		case 'p':	period = atoi(optarg);		break;
+		case 's':	if (2!=sscanf(optarg, "%dx%d",
+							&width, &height)) {
+					fprintf(stderr, "'%s' bad\n", optarg);
+					exit(1);
+				}
 		case 'v':	verbosity++;			break;
 		}
 	}
@@ -185,6 +190,10 @@ else		fprintf(stderr, "just one shoot...\n");
 t_debut = dtime();
 
 foo = lancement_thread_son(0);
+if (foo) {
+	fprintf(stderr, "erreur %d lancment thread son\n", foo);
+	exit(1);
+	}
 
 initialise_ecran(0);
 
diff --git a/Beep/display.c b/Beep/display.c
index 31c246a..08a8be1 100644
--- a/Beep/display.c
+++ b/Beep/display.c
@@ -24,6 +24,8 @@ standout(); mvaddstr(0, 0, chaine); standend();
 
 refresh();
 
+fprintf(stderr, "%s: COLS=%d LINES=%d\n", __func__, COLS, LINES);
+
 return 0;
 }
 /* ---------------------------------------------------------------- */
diff --git a/Beep/funcs.c b/Beep/funcs.c
index 9d8db55..ab10f66 100644
--- a/Beep/funcs.c
+++ b/Beep/funcs.c
@@ -10,7 +10,7 @@
 
 /* --------------------------------------------------------------------- */
 /*
- *
+ *	calculs sur une zone de l'image
  *	valeur retournee entre 0 et 255
  */
 double niveau_zone(unsigned char *datas, int w, int h, Rect *rp)
diff --git a/Beep/process.c b/Beep/process.c
index dd753ef..0bfe699 100644
--- a/Beep/process.c
+++ b/Beep/process.c
@@ -1,3 +1,7 @@
+/*
+ *		AlguaBeep
+ */
+
 #include  <stdio.h>
 #include  <stdlib.h>
 #include  <string.h>
@@ -81,11 +85,11 @@ if (stand)	standend();
 
 static double i2freq(int i)
 {
-i = 333+i*42;
+i = 333+i*42;				/* please explain */
 
 if (0==i)	abort();
 
-return 30.0* (1.0 / (double)i);
+return 30.0* (1.0 / (double)i);		/* please explain */
 }
 
 static int generate_samples(short *where, int size, Datum *datas)
@@ -120,6 +124,7 @@ mvaddstr(35, 0, chaine);
 return 0;
 }
 
+/* --------------------------------------------------------------------- */
 
 
 int charcuteur(unsigned char *datas, int w, int h, int K)
@@ -262,14 +267,14 @@ void * thr_action(void *ptr)
 long		idx;
 // int		foo;
 
-// #if DEBUG_LEVEL
+#if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( %p )\n", __func__, ptr);
 fprintf(stderr, "    value is %d\n", *(int *)ptr);
-// #endif
+#endif
 
 while(1) {
 	if (verbosity > 1) {
-		fprintf(stderr, "%s t=%g\n", __func__, dtime() - debut);
+		fprintf(stderr, "%s t=%.3g\n", __func__, dtime() - debut);
 		}
 
 	for (idx=0; idx<100; idx++) {
@@ -296,6 +301,10 @@ debut = dtime();
 pid = getpid();
 foo = pthread_create(&thread, NULL, thr_action, &pid);
 fprintf(stderr, "thread creation -> %d\n", foo);
+if (foo) {
+	fprintf(stderr, "epic fail in %s:%s\n", __FILE__, __func__);
+	exit(1);
+	}
 
 return 0;
 }