diff -urN midi_prog-/pitdet.c midi_prog/pitdet.c
--- midi_prog-/pitdet.c	Fri Aug 28 00:00:00 2015
+++ midi_prog/pitdet.c	Sat Sep  5 00:00:00 2015
@@ -50,8 +50,8 @@
 	if((pd->wk = malloc(sizeof(*pd->wk) * pd->m)) == NULL) ERR("No Mem");
 }
 
-static void
-shadow_cut(struct pitdet *pd, double sec)
+void
+pitdet_shadow_cut(struct pitdet *pd, double sec)
 {
 	int j;
 
@@ -127,7 +127,7 @@
 	if((pd->oldest.update = (pd->oldest.sec != osec)) != 0) pd->oldest.sec = osec;
 	if((pd->newest.update = (pd->newest.sec != nsec)) != 0) pd->newest.sec = nsec;
 
-	if(pd->newest.update && pd->newest.sec >= 0) shadow_cut(pd, pd->newest.sec);
+	if(pd->newest.update && pd->newest.sec >= 0) pitdet_shadow_cut(pd, pd->newest.sec);
 }
 
 int
diff -urN midi_prog-/pitdet.h midi_prog/pitdet.h
--- midi_prog-/pitdet.h	Fri Aug 28 00:00:00 2015
+++ midi_prog/pitdet.h	Sat Sep  5 00:00:00 2015
@@ -34,6 +34,7 @@
 double pitdet_freq_to_note(struct pitdet *pd, double freq);
 
 void pitdet_init(struct pitdet *pd, double smp_freq, int ac, char **av);
+void pitdet_shadow_cut(struct pitdet *pd, double sec);
 void pitdet_add(struct pitdet *pd, double v);
 
 int pitdet_sec_to_tick(struct pitdet *pd, double sec);
diff -urN midi_prog-/tool.c midi_prog/tool.c
--- midi_prog-/tool.c	Tue Sep  1 00:00:00 2015
+++ midi_prog/tool.c	Sat Sep  5 00:00:00 2015
@@ -80,7 +80,7 @@
 	struct pitdet *pd;
 	int note;
 	double on_sec;
-	int pre_release;
+	double pre_release;
 	int cut_over_tone;
 } note_onoff[ NOTE_N ];
 
@@ -151,7 +151,7 @@
 	nto->on_sec = -1;
 
 	if(nto->pre_release > 0){
-		int off_lmt = on_sec + nto->ct.lmt_sec;
+		double off_lmt = on_sec + 1.0 / nto->pd->tick_freq;
 		off_sec -= nto->pre_release;
 		if(off_sec < off_lmt) off_sec = off_lmt;
 	}
@@ -204,6 +204,8 @@
 	int midi = opt_idx("-midi", ac, av) > 0;
 	int abuf_wsec_chk = opt_idx("-abuf_wsec_chk", ac, av) > 0;
 	int sec, s;
+	FILE *pd_load = fp_get("-pd_load", ac, av, NULL, "r", NULL);
+	FILE *pd_save = fp_get("-pd_save", ac, av, NULL, "w", NULL);
 
 	in_init(&in, ac, av, NULL);
 	pitdet_init(&pd, in.smp_freq, ac, av);
@@ -219,6 +221,27 @@
 		}
 	}
 
+	while(pd_load){
+		int j;
+		if(fread(&pd.newest.sec, sizeof(double), 1, pd_load) <= 0) return 0;
+		fread(&pd.max_v, sizeof(double), 1, pd_load);
+		for(j=0; j<pd.m; j++){
+			struct pitch *p = &pd.arr[j];
+			double v;
+			fread(&v, sizeof(double), 1, pd_load);
+			abuf_add(&p->ab, v);
+		}
+		pitdet_shadow_cut(&pd, pd.newest.sec);
+
+		if((s = (int)pd.newest.sec) != sec){
+			sec = s;
+			fprintf(stderr, "%d sec   \r", sec);
+		}
+
+		if(show) show_spectre(&pd, ac, av);
+		if(midi) midi_out(&pd);
+	}
+
 	while(in_do_mono(&in, &v) != EOF){
 		pitdet_add(&pd, v);
 		if(!pd.newest.update) continue;
@@ -229,6 +252,17 @@
 		}
 
 		if(pd.newest.sec < 0) continue;
+
+		if(pd_save){
+			int j;
+			fwrite(&pd.newest.sec, sizeof(double), 1, pd_save);
+			fwrite(&pd.max_v, sizeof(double), 1, pd_save);
+			for(j=0; j<pd.m; j++){
+				struct pitch *p = &pd.arr[j];
+				double v = tbuf_get_dbl(&p->ab.tb, pd.newest.sec);
+				fwrite(&v, sizeof(double), 1, pd_save);
+			}
+		}
 
 		if(show) show_spectre(&pd, ac, av);
 		if(midi) midi_out(&pd);
diff -urN midi_prog-/util.c midi_prog/util.c
--- midi_prog-/util.c	Sat Aug 29 00:00:00 2015
+++ midi_prog/util.c	Sat Sep  5 00:00:00 2015
@@ -179,8 +179,6 @@
 		ct->chg_try_sec = -1;
 		return 0;
 	}
-	if(sec - ct->sec < ct->lmt_sec) return 0;
-
 	if(ct->chg_try_sec < 0){
 		ct->chg_try_sec = sec;
 		return 0;