diff --git a/.gitignore b/.gitignore
index 3159585..fa375db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 # directories to ignore
 libcw
+io
 
 .deps
 autom4te.cache
diff --git a/examples/sine_file_01/out.wav b/examples/sine_file_01/out.wav
deleted file mode 100644
index 3ef5b7e..0000000
Binary files a/examples/sine_file_01/out.wav and /dev/null differ