diff --git a/README.md b/README.md
index 5cae354..d081473 100644
--- a/README.md
+++ b/README.md
@@ -26,8 +26,13 @@ CLK -> D5
 MISO -> D6
 ```
 
+## TODOs
+* Card Reader with SPI. Configure hspi, second SPI channel?
+
+![](images/wemos-d1-mini-esp32.png)
 
 ## Links
 
 https://github.com/earlephilhower/ESP8266Audio
 
+[Running two SPI devices at once](https://randomnerdtutorials.com/esp32-spi-communication-arduino/)
diff --git a/src/main.cpp b/src/main.cpp
index 95b0e07..06e7b29 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -30,6 +30,8 @@ const int startDelay = 250;
 
 Audio audio;
 
+uint volume = 18;
+
 AsyncWebServer server(80);
 DNSServer dns;
 
@@ -69,6 +71,18 @@ void audio_info(const char *info)
   // Serial.print("info        "); Serial.println(info);
 }
 
+void mute() {
+  if (audio.getVolume()!=0) {
+    volume = audio.getVolume();
+  }
+  
+  audio.setVolume(0);
+}
+
+void unmute() {
+  audio.setVolume(volume);
+}
+
 String getState()
 {
   String state = String();
@@ -133,7 +147,7 @@ void start()
 }
 
 void next()
-{
+{ 
   playNextMp3();
 }
 
@@ -170,7 +184,7 @@ void setup()
 
   // printDirectory(root, 0);
   audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
-  audio.setVolume(12); // 0...21
+  audio.setVolume(volume); // 0...21
 
   server.on("/", HTTP_GET, [](AsyncWebServerRequest *request)
             { request->send_P(200, "text/html", index_html, processor); });