Update 'README.md'

README.md

@@ -6,6 +6,16 @@
 ## Operating System
  [Raspberry PI OS](/marcio.fernandes/raspberrypi)
 
+## alsa plugin equalizer
+
+### Install
+    
+    sudo apt install -y libasound2-plugin-equal
+
+### Hot to use
+
+    alsamixer -D equal
+
 ## HiFiBerry Setup
 *[Information source](https://www.hifiberry.com/docs/software/configuring-linux-3-18-x/)*
   
@@ -27,7 +37,8 @@ Reboot
 
 ### Install
 
-    sudo apt update && sudo apt install bluealsa -y
+    sudo apt install bluealsa -y
+    
 
 ### Start on boot