diff -urN v7/gui.py v8/gui.py
--- v7/gui.py	2020-01-25 01:50:02.000000000 +0900
+++ v8/gui.py	2020-01-26 19:37:29.000000000 +0900
@@ -19,6 +19,9 @@
 		vsz.Add( hsz, 0, flag, border )
 	return vsz
 
+def set_min_w(o, w):
+	o.SetMinSize((w, -1))
+
 def init(app, title):
 	rdr = io_ut.reader_new( sys.stdin, 1, no_buf=True )
 
@@ -37,8 +40,12 @@
 		lock.release()
 		return rep
 
-	while comm('', rdr.readline) != 'ready\n':
-		pass
+	while True:
+		s = comm('', rdr.readline)
+		if s == 'ready\n':
+			break
+		if not s:
+			sys.exit(1)
 
 	frame = wx.Frame(None, wx.ID_ANY, title)
 
@@ -57,8 +64,30 @@
 	shifts = (2, 1, 0, -1)
 	get_shift = lambda : shifts[ menu_speed.GetSelection() ]
 
+	btn_rw = wx.Button( frame, wx.ID_ANY, '<<' )
+	set_min_w(btn_rw, 40)
+	btn_ff = wx.Button( frame, wx.ID_ANY, '>>' )
+	set_min_w(btn_ff, 40)
+
+	btn_div = wx.Button( frame, wx.ID_ANY, '' )
+	btn_div.Enable(False)
+	area = wx.StaticText( frame, wx.ID_ANY,'-/-' )
+	set_min_w(area, 40)
+
+	def div_update():
+		cmd = 'dbg.out( snd.div_join_label() )'
+		s = comm(cmd, rdr.readline).strip()
+		btn_div.SetLabel(s)
+		en = (s != '')
+		btn_div.Enable(en)
+
+	def area_update():
+		cmd = 'dbg.out("{}".format( snd.curr_area() ) )'
+		s = comm(cmd, rdr.readline).strip()
+		area.SetLabel(s)
 
 	pos = wx.StaticText( frame, wx.ID_ANY,'-' )
+	set_min_w(pos, 40)
 	def pos_update():
 		cmd = 'dbg.out("{}".format( snd.get_sec() ) )'
 		s = comm(cmd, rdr.readline).strip()
@@ -71,6 +100,7 @@
 		pos_ev.wait(tmout)
 		pos_ev.clear()
 		pos_update()
+		wx.CallAfter(area_update)
 
 	th = thr.loop_new(th_func)
 	def th_stop():
@@ -91,16 +121,25 @@
 		s = ''
 		if o == btn_play:
 			s = 'snd.{}()'.format( 'start' if is_play() else 'stop' )
-			pos_ev.set()
 		elif o == cbox_reverse:
 			s = 'snd.reverse={}'.format( o.GetValue() )
 		elif o == menu_speed:
 			s = 'snd.shift={}'.format( get_shift() )
+		elif o == btn_div:
+			s = 'snd.div_join()'
+		elif o == btn_rw:
+			s = 'snd.rw()'
+		elif o == btn_ff:
+			s = 'snd.ff()'
 
-		if o in (cbox_reverse, menu_speed) and is_play():
+		if o in (cbox_reverse, menu_speed, btn_rw, btn_ff) and is_play():
 			s = '\n'.join( ( 'snd.stop()', s, 'snd.start()' ) )
 		if s:
 			comm(s)
+		if o in (btn_play, btn_div, btn_rw, btn_ff):
+			pos_ev.set()
+			wx.CallAfter( div_update )
+			wx.CallAfter( area_update )
 
 	def quit_hdl(evt):
 		dbg.err('quit')
@@ -110,9 +149,16 @@
 	frame.Bind( wx.EVT_TOGGLEBUTTON, hdl, btn_play )
 	frame.Bind( wx.EVT_CHECKBOX, hdl, cbox_reverse )
 	frame.Bind( wx.EVT_CHOICE, hdl, menu_speed )
+	frame.Bind( wx.EVT_BUTTON, hdl, btn_rw )
+	frame.Bind( wx.EVT_BUTTON, hdl, btn_ff )
+	frame.Bind( wx.EVT_BUTTON, hdl, btn_div )
 	frame.Bind( wx.EVT_CLOSE, quit_hdl )
 
-	szr = wrap( [ (btn_play, cbox_reverse, menu_speed), (pos,) ] )
+	szr = wrap( [
+		(btn_rw, btn_play, btn_ff),
+		(cbox_reverse, menu_speed),
+		(pos, btn_div, area),
+	] )
 	frame.SetSizer(szr)
 	frame.Layout()
 	frame.Fit()
diff -urN v7/snddiv.py v8/snddiv.py
--- v7/snddiv.py	2020-01-25 00:53:31.000000000 +0900
+++ v8/snddiv.py	2020-01-26 19:34:56.000000000 +0900
@@ -226,6 +226,16 @@
 			divs.append(e.sec)
 			divs.sort()
 
+	def div_join_label():
+		if not e.play:
+			if e.sec in divs:
+				i = divs.index(e.sec)
+				if i not in (0, len(divs)-1):
+					return 'join'
+			else:
+				return 'div'
+		return ''
+
 	def ff():
 		if e.sec >= divs[-1]:
 			return
@@ -246,6 +256,14 @@
 		if 0 <= i and i < len(divs)-1:
 			data.save( divs[i], divs[i+1], name )
 
+	def curr_area():
+		n = len(divs) - 1
+		sec = get_sec()
+		for i in range(n):
+			if divs[i] < sec and sec <= divs[i+1]:
+				return '{}/{}'.format(i+1, n)
+		return '{}/{}'.format(1, n)
+
 	return empty.to_attr( e, locals() )
 
 def get_args():
diff -urN v7/snddiv.sh v8/snddiv.sh
--- v7/snddiv.sh	1970-01-01 09:00:00.000000000 +0900
+++ v8/snddiv.sh	2020-01-26 19:34:56.000000000 +0900
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+./stdio.sh ./gui.py "./snddiv.py -silent $1"
+
+# EOF