diff -urN midi_prog-/midtxt.c midi_prog/midtxt.c
--- midi_prog-/midtxt.c	2015-06-09 00:00:00.000000000 +0900
+++ midi_prog/midtxt.c	2015-06-21 00:00:00.000000000 +0900
@@ -345,6 +345,74 @@
 	return strtol(sp, NULL, 0) * 12 + i;
 }
 
+void
+note_to_str(int note, char *buf)
+{
+	char *tbl[] = { "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B", NULL };
+	sprintf(buf, "%s%d", tbl[note % 12], note / 12);
+}
+
+void
+chord_notes_get(char *name, char *buf)
+{
+	struct{
+		char *name;
+		int n;
+		int *lst;
+	} chord_info[] = {
+		{ "",     3, (int []){ 4, 3, 5 } },
+		{ "m",    3, (int []){ 3, 4, 5 } },
+		{ "dim",  3, (int []){ 3, 3, 6 } },
+		{ "aug",  3, (int []){ 4, 4, 4 } },
+		{ "sus4", 3, (int []){ 5, 2, 5 } },
+		{ "7",    4, (int []){ 4, 3, 3, 2 } },
+		{ "M7",   4, (int []){ 4, 3, 4, 1 } },
+		{ "m7",   4, (int []){ 3, 4, 3, 2 } },
+		{ NULL,   0, NULL },
+	}, *inf;
+
+	char src[16], key[8], *sp, *dp, *p;
+	int base_note, key12, base12, si, i, n;
+
+	strcpy(src, name);
+	sp = src;
+	dp = key;
+	*dp++ = *sp++;
+	if(*sp == '#') *dp++ = *sp++;
+	*dp++ = '0';
+	*dp = '\0';
+	key12 = str_to_note(key);
+
+	if((p = strchr(sp, '/')) == NULL) ERR("format");
+	*p++ = '\0';
+	
+	for(inf=chord_info; inf->name; inf++) if(strcmp(inf->name, sp) == 0) break;
+	if(inf->name == NULL) ERR("foramt chord /");
+
+	base_note = str_to_note(p);
+	base12 = base_note % 12;
+
+	n = inf->n;
+	si = 0;
+	if(key12 != base12){
+		for(si=1; si < n; si++){
+			key12 = (key12 + inf->lst[si-1]) % 12;
+			if(key12 == base12) break;
+		}
+		if(si >= n){
+			MSG(name); 
+			ERR("format chord");
+		}
+	}
+	for(i=0; i<n; i++){
+		note_to_str(base_note, buf);
+		if(i >= n-1) continue;
+		strcat(buf, ",");
+		buf += strlen(buf);
+		base_note += inf->lst[ (si + i) % n ];
+	}
+}
+
 char *
 np_update(char *np)
 {
@@ -357,27 +425,49 @@
 len_to_delta_conv(int ac, char **av)
 {
 	int div4 = opt_int("-div4", ac, av, 96);
-	char buf[BUFSZ], len_buf[BUFSZ], notes_buf[BUFSZ], opt_buf[BUFSZ], sla[8], *np, note_buf[BUFSZ];
-	int len, len_on, ch, note, velo, delta;
+	int def_ch = opt_int("-ch", ac, av, 0);
+	int def_velo = opt_int("-velo", ac, av, 100);
+	int len, len_on, ch, note, velo, delta, l_ac, i;
+	char buf[BUFSZ], lbuf[BUFSZ], *l_av[AVSZ], notes_buf[BUFSZ], note_buf[BUFSZ];
+	char *len_buf, *vp, *notes_str, *chord_str, *sla, *np;
 
 	while(fgets(buf, sizeof(buf), stdin)){
 		if(buf[0] == '#' || buf[0] == ';' || buf[0] == '\n' || buf[0] == '\0') continue;
 
-		velo=100;
-		strcpy(opt_buf, "");
-		if(sscanf(buf, "len=%s ch=%d note=%s %s", len_buf, &ch, notes_buf, opt_buf) <= 0){
+		strcpy(lbuf, buf);
+		l_ac = ARR_N(l_av);
+		line_to_ac_av(lbuf, &l_ac, l_av);
+
+		if((len_buf = opt_prefix("len=", l_ac, l_av)) == NULL){
 			fputs(buf, stdout);
 			continue;
 		}
-		strcpy(sla, "");
-		if(sscanf(opt_buf, "velo=%d %s", &velo, sla) == 0){
-			sscanf(opt_buf, "%s", sla);
+		len_get(len_buf, div4, &len, &len_on);
+
+		notes_str = opt_prefix("note=", l_ac, l_av);
+		chord_str = opt_prefix("chord=", l_ac, l_av);
+		if(notes_str == NULL && chord_str == NULL) ERR("format, no note and no chord");
+
+		if(chord_str){
+			notes_buf[0] = '\0';
+			if(notes_str) strcpy(notes_buf, notes_str);
+			chord_notes_get(chord_str, notes_buf + strlen(notes_buf));
+			notes_str = notes_buf;
 		}
 
-		len_get(len_buf, div4, &len, &len_on);
+		ch = def_ch;
+		if((vp = opt_prefix("ch=", l_ac, l_av)) != NULL) ch = strtol(vp, NULL, 0);
+
+		velo = def_velo;
+		if((vp = opt_prefix("velo=", l_ac, l_av)) != NULL) velo = strtol(vp, NULL, 0);
+
+		sla = "";
+		if((i = opt_idx("<", l_ac, l_av)) >= 0) sla = l_av[i];
+		else if((i = opt_idx("-", l_ac, l_av)) >= 0) sla = l_av[i];
+		else if((i = opt_idx(">", l_ac, l_av)) >= 0) sla = l_av[i];
 
 		if(strcmp(sla, "-") != 0 && strcmp(sla, ">") != 0){
-			for(np=notes_buf; np && sscanf(np, "%[^,]", note_buf) == 1; np=np_update(np)){
+			for(np=notes_str; np && sscanf(np, "%[^,]", note_buf) == 1; np=np_update(np)){
 				if((note = str_to_note(note_buf)) < 0){
 					printf("delta=0 cmd=f8\n");
 				}else{
@@ -390,7 +480,7 @@
 
 		if(strcmp(sla, "-") != 0 && strcmp(sla, "<") != 0){
 			delta = len_on;
-			for(np=notes_buf; np && sscanf(np, "%[^,]", note_buf) == 1; np=np_update(np)){
+			for(np=notes_str; np && sscanf(np, "%[^,]", note_buf) == 1; np=np_update(np)){
 				if((note = str_to_note(note_buf)) < 0){
 					printf("delta=%d cmd=f8\n", delta);
 				}else{
diff -urN midi_prog-/util.c midi_prog/util.c
--- midi_prog-/util.c	2015-06-09 00:00:00.000000000 +0900
+++ midi_prog/util.c	2015-06-21 00:00:00.000000000 +0900
@@ -37,6 +37,22 @@
 	return strtod(s, NULL);
 }
 
+void
+line_to_ac_av(char *line, int *ac, char **av)
+{
+	int i, n = *ac;
+	for(i=0; i<n && (av[i] = strtok(line, " \t\n")) != NULL; i++, line = NULL);
+	*ac = i;
+}
+
+char *
+opt_prefix(char *prev, int ac, char **av)
+{
+	int i, n = strlen(prev);
+	for(i=0; i<ac; i++) if(strncmp(av[i], prev, n) == 0) break;
+	return i < ac ? av[i] + n : NULL;
+}
+
 int
 opt_ch_loop_get(char **sp, int *ch, int *v)
 {
diff -urN midi_prog-/util.h midi_prog/util.h
--- midi_prog-/util.h	2015-06-09 00:00:00.000000000 +0900
+++ midi_prog/util.h	2015-06-21 00:00:00.000000000 +0900
@@ -12,7 +12,9 @@
 #define OFF		0
 #define ON		1
 #define BUFSZ		1024
+#define AVSZ		16
 
+#define ARR_N(arr)		( sizeof (arr) / sizeof *(arr) )
 #define MIX(a, b, rate)		( (a) * (1 - (rate)) + (b) * (rate) )
 
 int opt_idx(char *key, int ac, char **av);
@@ -20,6 +22,9 @@
 int opt_int(char *key, int ac, char **av, int def);
 double opt_double(char *key, int ac, char **av, double def);
 
+void line_to_ac_av(char *line, int *ac, char **av);
+char *opt_prefix(char *prev, int ac, char **av);
+
 int opt_ch_loop_get(char **sp, int *ch, int *v);
 int opt_ch_loop_get_dbl(char **sp, int *ch, double *v);