diff -ur kon_ut.now/snd_ut.py kon_ut.v14/snd_ut.py
--- kon_ut.now/snd_ut.py	2022-05-02 19:32:50.000000000 +0900
+++ kon_ut.v14/snd_ut.py	2022-05-03 00:56:07.078974172 +0900
@@ -184,10 +184,16 @@
 
 	e = empty.new()
 	e.raw_bytes = None
+	e.exists_raw = False
+
+	def make_raw():
+		if not e.exists_raw:
+			make( name, 'raw', 'load' )
+			e.exists_raw = True
 
 	def get_bytes_cache(start_sec=0, end_sec=-1):
 		if e.raw_bytes == None:
-			make( name, 'raw', 'load' )
+			make_raw()
 			e.raw_bytes = load_bytes( name + '.raw' )
 
 		if start_sec == 0 and end_sec < 0:
@@ -201,6 +207,7 @@
 		if cache:
 			return get_bytes_cache( start_sec, end_sec )
 
+		make_raw()
 		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 )