readme update

README.md

@@ -15,7 +15,6 @@
 
 ```
 config.txt
-click.wav
 sound/
   ├─ 1.wav
   ├─ 2.wav
@@ -25,6 +24,9 @@ sound/
   ├─ 6.wav
   ├─ 7.wav
   ├─ 8.wav
+ui/
+  ├─ click.wav
+  ├─ beep.wav
 
 ```
 
@@ -66,21 +68,31 @@ Json formatted config file. For now only edge led color working.
 }
 ```
 
-### click.wav
+## Sound
 
-Put a file called `click.wav` (not longer than a few seconds) in the root of the SD card and it will play when you press a button.
+### UI
+
+There are two UI sounds - `click.wav` and `beep.wav`.
+
+- `click.wav` is played when a button is pressed other than the select button
+- `beep.wav` is played when the rotary encoder select button is pressed
+
+Put these files in the subfolder `ui` on the SD card.
+
+#### Wave File Format for UI Sounds
+
+`click.wav` needs to be **22050Hz (22kHz) 16bit Mono**
 
 
-### Sounds
+### Audio Out or Speakers
 
 Put all sounds into the `/sound` subfolder. Name them `1.wav, 2.wav, 3.wav...`
 
 
-## Wave File Format
+#### Wave File Format for Audio Out and Speakers
 
-Export all sounds except `click.wav` as **48000Hz (48kHz) 16bit Stereo**.
+Export all sounds as **48000Hz (48kHz) 16bit Stereo**.
 
-`click.wav` needs to be **22050Hz (22kHz) 16bit Mono**
 
 ### Audacity
 
@@ -94,14 +106,14 @@ Download it here [Github](https://github.com/audacity/audacity/releases)
 
 #### Format options in Audacity
 
-**Sounds**
+**Audio Out**
 
 - WAV(Microsoft)
 - Chanels: Stereo
 - Samplerate: 48000Hz
 - Encoding: Signed 16-bit PCM
 
-**click.wav**
+**UI**
 
 - WAV(Microsoft)
 - Channels: Mono