diff -ur kon_ut.old/snd_ut.py kon_ut.now/snd_ut.py
--- kon_ut.old/snd_ut.py	2020-09-23 20:58:44.000000000 +0900
+++ kon_ut.now/snd_ut.py	2022-05-02 18:46:14.487021370 +0900
@@ -49,6 +49,23 @@
 	wait_msg.stop()
 	return b
 
+def load_bytes_part( name, from_byte=None, to_byte=None ):
+	if from_byte is None and to_byte is None:
+		return load_bytes( name )
+
+	if from_byte is None:
+		from_byte = 0
+
+	if to_byte is None:
+		st = os.lstat( name )
+		to_byte = st.st_size
+
+	b = bytes( [] )
+	with open( name, 'rb' ) as f:
+		if from_byte > 0:
+			f.seek( from_byte )
+		b = f.read( to_byte - from_byte )
+	return b
 
 def save_bytes(name, b):
 	wait_msg = wait_msg_new( 'save ' + name )
@@ -168,7 +185,7 @@
 	e = empty.new()
 	e.raw_bytes = None
 
-	def get_bytes(start_sec=0, end_sec=-1):
+	def get_bytes_cache(start_sec=0, end_sec=-1):
 		if e.raw_bytes == None:
 			make( name, 'raw', 'load' )
 			e.raw_bytes = load_bytes( name + '.raw' )
@@ -180,6 +197,14 @@
 		end = inf.byte_sec( end_sec ) if end_sec >= 0 else len( e.raw_bytes )
 		return e.raw_bytes[ start : end ]
 
+	def get_bytes( start_sec=0, end_sec=-1, cache=True ):
+		if cache:
+			return get_bytes_cache( start_sec, end_sec )
+
+		from_byte = inf.byte_sec( start_sec )
+		to_byte = inf.byte_sec( end_sec ) if end_sec >= 0 else None
+		return load_bytes_part( name + '.raw', from_byte, to_byte )
+
 	def get_arr(start_sec=0, end_sec=-1):
 		b = get_bytes( start_sec, end_sec )
 		return bytes_to_arr( b )
diff -ur kon_ut.old/wx_ut.py kon_ut.now/wx_ut.py
--- kon_ut.old/wx_ut.py	2020-10-01 20:03:50.000000000 +0900
+++ kon_ut.now/wx_ut.py	2022-05-02 18:46:17.824626208 +0900
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import os
 import wx
 
 import empty
@@ -333,19 +334,36 @@
 			e.app = self
 			e.frame = wx_new( wx.Frame, title, parent=None )
 			bind( e.frame, quit_hdl, wx.EVT_CLOSE )
+			set_icon()
 
 			init( e )
 
 			e.frame.Layout()
 			e.frame.Fit()
+			e.frame.FitInside()
 			e.app.SetTopWindow( e.frame )
 
+			( w, h ) = e.frame.GetSize()
+			e.frame.SetMinSize( ( w, h + 10 ) )  # title bar height ?
+
 			if e.on_init:
 				e.on_init( e )
 			else:
 				e.frame.Show()
 			return 1
 
+	def set_icon( path='hoge.png' ):
+		if not e.frame:
+			return
+
+		if not os.path.exists( path ):
+			return
+
+		bm = wx.Bitmap( path )
+		icon = wx.EmptyIcon()
+		icon.CopyFromBitmap( bm )
+		e.frame.SetIcon( icon )
+
 	def poll_start(poll_func, sec, hz, gc):
 		th = None
 		if poll_func: