diff --git a/docs/notes/box64.md b/docs/notes/box64.md
index 443d5cb..e6e9852 100644
--- a/docs/notes/box64.md
+++ b/docs/notes/box64.md
@@ -110,5 +110,13 @@ export DISPLAY=:0
 export WINEPREFIX='/opt/win32'
 ```
 
+#### chroot system
+
+```
+~/.asoundrc 
+defaults.ctl.card 0 
+defaults.pcm.card 0
+defaults.pcm.device 0
+```