diff -ur v4/snddiv.py v5/snddiv.py
--- v4/snddiv.py	2020-01-20 12:58:17.171850000 +0900
+++ v5/snddiv.py	2020-01-20 21:23:00.000000000 +0900
@@ -91,6 +91,28 @@
 			lst = lst[:: 2**shift ]
 		return b''.join(lst)
 
+	def get_smp_from_to(sec_f, sec_t):
+		f = opt.smp_sec(sec_f)
+		t = opt.smp_sec(sec_t)
+		return smp_lst[f:t]
+
+	def get_dat_from_to(sec_f, sec_t):
+		lst = get_smp_from_to(sec_f, sec_t)
+		return b''.join(lst)
+
+	def save(sec_f, sec_t, name):
+		dbg.out('save ... ', '')
+		dat = get_dat_from_to(sec_f, sec_t)
+		with open( '{}.raw'.format(name), 'wb' ) as f:
+			f.write(dat)
+		cmd = 'sox {} {}.raw {}.wav'.format( opt.get_raw_opt(), name, name )
+		cmd_ut.call(cmd)
+		cmd = 'lame {}.wav {}.mp3 > /dev/null 2>&1'.format( name, name )
+		cmd_ut.call(cmd)
+		cmd = 'rm -f {}.raw {}.wav'.format( name, name )
+		cmd_ut.call(cmd)
+		dbg.out('OK')
+
 	last_sec = opt.byte_to_sec( len(dat) )
 
 	return empty.new( locals() )
@@ -174,6 +196,8 @@
 	e.reverse = False
 	e.shift = 0
 
+	divs = [ 0, data.last_sec ]
+
 	def get_sec():
 		add = 0
 		if e.play:
@@ -196,6 +220,35 @@
 		e.sec = get_sec()
 		e.play = None
 
+	def div_join():
+		if e.sec in divs:
+			i = divs.index(e.sec)
+			if i not in (0, len(divs)-1):
+				divs.pop(i)
+		else:
+			divs.append(e.sec)
+			divs.sort()
+
+	def ff():
+		if e.sec >= divs[-1]:
+			return
+		for div in divs:
+			if div > e.sec:
+				e.sec = div
+				break
+
+	def rw():
+		if e.sec <= 0:
+			return
+		for div in divs[::-1]:
+			if div < e.sec:
+				e.sec = div
+				break
+
+	def save(i, name):
+		if 0 <= i and i < len(divs)-1:
+			data.save( divs[i], divs[i+1], name )
+
 	return empty.to_attr( e, locals() )
 
 def get_args():