diff -ur v14/snddiv.py v15/snddiv.py
--- v14/snddiv.py	2022-05-03 00:56:16.000000000 +0900
+++ v15/snddiv.py	2022-05-03 15:22:15.000000000 +0900
@@ -81,7 +81,7 @@
 
 	return empty.to_attr( e, locals() )
 
-def snd_new( data, sudo_passwd, cache ):
+def snd_new( data, sudo_passwd, cache, step_sec ):
 	inf = data.inf
 	last_sec = inf.smp_to_sec( inf.smp_n )
 	dbg.out( 'last_sec={}'.format( last_sec ) )
@@ -160,8 +160,6 @@
 				e.fin = True
 				return get_dat_sec( e.sec, reverse, shift )
 
-			step_sec = 5.0
-
 			if reverse:
 				sec_t = e.sec
 				sec_f = max( e.sec - step_sec, 0 )
@@ -273,16 +271,17 @@
 	sudo_passwd = a.pop_str('-S')
 	silent = a.is_pop('-silent')
 	cache = a.is_pop( '-cache' )
+	step_sec = a.pop_v( '-step_sec', 5.0 )
 	filename_mp3 = a.pop()
 	if not filename_mp3:
-		dbg.help_exit( '[-g] [-S sudo_passwd] [-silent] [-cache] filename_mp3' )
+		dbg.help_exit( '[-g] [-S sudo_passwd] [-silent] [-cache] [-step_sec 5.0] filename_mp3' )
 
 	snd_ut.silent = silent
 	dbg_out = lambda s, tail='\n': None if silent else dbg.out
 
 	data = snd_ut.data_new(filename_mp3)
 
-	snd = snd_new( data, sudo_passwd, cache )
+	snd = snd_new( data, sudo_passwd, cache, step_sec )
 
 	rdr = io_ut.reader_new( sys.stdin, 1, no_buf=True )
 
diff -ur v14/snddiv_gui.py v15/snddiv_gui.py
--- v14/snddiv_gui.py	2020-09-23 20:59:31.000000000 +0900
+++ v15/snddiv_gui.py	2022-05-03 15:22:15.000000000 +0900
@@ -36,6 +36,9 @@
 		if not s:
 			sys.exit(1)
 
+	cmd = "dbg.out( '{} ({})'.format( filename_mp3, dbg.quantize( snd.last_sec, '.01' ) ) )"
+	s = comm( cmd, rdr.readline ).strip()
+	name = wxo.label_new( s )
 
 	play_lbs = ( ' Play |>', ' Play <|', 'Pause ||' )
 	btn_play = wxo.toggle_new( play_lbs[ 0 ], min_w=104 )
@@ -45,8 +48,8 @@
 	cbox_reverse = wxo.wx_new( wx.CheckBox, 'reverse' )
 	is_reverse = lambda : cbox_reverse.GetValue()
 
-	speed_lbs = ('x4', 'x2', 'x1', 'x0.5')
-	shifts = (2, 1, 0, -1)
+	speed_lbs = ( 'x32', 'x16', 'x8', 'x4', 'x2', 'x1', 'x0.5', 'x0.25' )
+	shifts = ( 5, 4, 3, 2, 1, 0, -1, -2 )
 	menu_speed = wxo.menu_new( speed_lbs, None, 'x1', shifts )
 	get_shift = lambda : wxo.menu_get( menu_speed ).v
 
@@ -73,7 +76,8 @@
 	def pos_update():
 		cmd = 'dbg.out("{}".format( snd.get_sec() ) )'
 		s = comm(cmd, rdr.readline).strip()
-		s = str( Decimal(s).quantize( Decimal('.01') ) )
+		#s = str( Decimal(s).quantize( Decimal('.01') ) )
+		s = str( dbg.quantize( s, '.01' ) )
 		wx.CallAfter( pos.SetLabel, s )
 
 	btn_save = wxo.button_new( 'save', min_w=50 )
@@ -158,6 +162,7 @@
 
 	wp = wxo.wp
 	lsts = [
+		wp( [ wp( name ) ] ),
 		wp( [ wp( btn_rw ), wp( btn_play, prop=1 ), wp( btn_ff ) ], prop=1, flag=wx.EXPAND ),
 		wp( [ wp( cbox_reverse ), wp( menu_speed ) ] ),
 		wp( [ wp( pos ), wp( btn_div ), wp( area ), wp( btn_save, prop=1 ) ], flag=wx.EXPAND ),