doc: usage

README.md

@@ -14,17 +14,19 @@ features.
 
 ## Usage
 
-You need to use a CSS template, like below to map your audio or MIDI events to some CSS properties.
+You need to use a custom CSS template, like below to map your audio or MIDI events to some CSS properties.
 
 ```css
 body {
-    background-color:rgba(0,0,0,[audio.meter.volume,0,1]);
+    background-color:rgba(0,[mid,0,255],0,[loud,0,1]);
 }
 h1 {
-    opacity: [midi.noteon.C];
+    opacity: [note:C];
 }
 ```
 
+To ***save*** your template, click on `Save` button or use keybind `CTRL`+`S`. To activate the extension, you can use `CTRL`+`O`.
+
 ### MIDI Variables
 
 | Midi Event  | Parameter | Informations                             |
@@ -51,7 +53,7 @@ For some audio or midi events, you can specify a range value. Just add `,<min>,<
 
 ```css
 a {
-  width: [audio.energy.treble,0,100]%;
+  width: [hi,0,100]%;
 }
 ```