diff --git a/sample.env b/sample.env
index d354c02..695b7ed 100644
--- a/sample.env
+++ b/sample.env
@@ -108,13 +108,14 @@ DEFAULT_PRESENTATION=./mod/nginx/default.pdf
 # - sv-se-jakob - Swedish (Sweden) Jakob
 # - zh-cn-sinmei - Chinese/China Sinmei
 # - zh-hk-sinmei - Chinese/Hong Kong Sinmei
-SOUNDS_LANGUAGE=en-us-callie
+#SOUNDS_LANGUAGE=en-us-callie
+SOUNDS_LANGUAGE=zh-cn-sinmei
 
 # set to false to disable listenOnlyMode
 LISTEN_ONLY_MODE=true
 
 # set to true to disable echo test
-DISABLE_ECHO_TEST=false
+DISABLE_ECHO_TEST=true
 
 # set to true to automatically share webcam
 AUTO_SHARE_WEBCAM=false