diff --git a/notes.md b/notes.md
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@@ -39,3 +39,13 @@
 - those speakers however use sine waves instead of square waves, so our
   first step should be focused on figuring out how to send sine waves at
   certain frequencies, perhaps with fast PWM
+
+## 2024-04-09
+- Asked Sam how to use PWM to handle no use of DAC.
+ - Test the new speaker on Friday without DAC to see if it sounds okay enough.
+ - Lets Try and talk to Rashid or other EE professors.
+ - I think we should also try and get a DAC from the Lab!
+- We looked into how to use the shift register to handle the fact that we have to many
+  buttons for the pins on the Uno.
+ - We can ask same for a shift register.
+- We looked into how to use the LCD display and got some Pseudo code from GPT to help.