diff --git a/00. Inbox/01. TODO.md b/00. Inbox/01. TODO.md
index e1c9eb2..5e7c2af 100644
--- a/00. Inbox/01. TODO.md	
+++ b/00. Inbox/01. TODO.md	
@@ -108,6 +108,9 @@
 
 ### Tiny
 - [ ] Forward HDMI-in audio to built-in speaker 🛫 2022-09-28 📅 2022-10-04
+    - 用AudioTrack可以從buffer來播放錄下來的PCM
+        - [Android音频开发之AudioTrack](https://www.jianshu.com/p/c67fd0c2b379)
+        - [深入剖析Android音频之AudioTrack](https://blog.csdn.net/yangwen123/article/details/39989751)
 
 #### Done
 - [x] Fix VCDroidTester2 crash problem 🛫 2022-09-12 📅 2022-09-16 ✅ 2022-09-19