diff --git a/FW/Leo_muziekdoos_fw/platformio.ini b/FW/Leo_muziekdoos_fw/platformio.ini
index db95a57..5f27236 100644
--- a/FW/Leo_muziekdoos_fw/platformio.ini
+++ b/FW/Leo_muziekdoos_fw/platformio.ini
@@ -14,7 +14,8 @@ board = blackpill_f411ce
 framework = arduino
 upload_protocol = stlink
 debug_tool = stlink
-lib_deps = stm32duino/STM32duino STM32SD@^1.2.3
+lib_deps = 
+	;stm32duino/STM32duino STM32SD@^1.2.3
 build_flags = 
 	-D PIO_FRAMEWORK_ARDUINO_ENABLE_CDC
 	-D PIO_FRAMEWORK_ARDUINO_USB_FULLSPEED_FULLMODE
diff --git a/FW/Leo_muziekdoos_fw/src/audio.cpp b/FW/Leo_muziekdoos_fw/src/audio.cpp
index 3443d04..8506e43 100644
--- a/FW/Leo_muziekdoos_fw/src/audio.cpp
+++ b/FW/Leo_muziekdoos_fw/src/audio.cpp
@@ -10,6 +10,7 @@ This example uses the SPI3 port tested on STM32F407VET "black" board. On other b
 I2S_HandleTypeDef hi2s3;
 DMA_HandleTypeDef hdma_spi3_tx;
 uint32_t dma_buffer[I2S_BUFFER_SIZE];
+//int16_t sine[WAV_SIZE]     = {0};
 // sinus oszillator
 float osc_phi = 0;
 float osc_phi_inc = 440.0f / 44100.0f; // generating 440HZ
@@ -37,6 +38,16 @@ void Error_Handler2(byte errorcode)
   }
 }
 
+void generateSine(int32_t amplitude, int16_t *buffer, uint16_t length)
+{
+  // Generate a sine wave signal with the provided amplitude and store it in
+  // the provided buffer of size length.
+  for (int i = 0; i < length; ++i)
+  {
+    buffer[i] = int16_t(float(amplitude) * sin(2.0 * PI * (1.0 / length) * i));
+  }
+}
+
 void FillBuffer(uint32_t *buffer, uint16_t len)
 {
   float a;
@@ -62,11 +73,13 @@ void StartAudioBuffers(I2S_HandleTypeDef *hi2s)
   // start circular dma
   HAL_I2S_Transmit_DMA(hi2s, (uint16_t *)dma_buffer, I2S_BUFFER_SIZE << 1);
 }
+
 extern "C" void HAL_I2S_TxCpltCallback(I2S_HandleTypeDef *hi2s)
 {
   // second half finished, filling it up again while first  half is playing
   FillBuffer(&(dma_buffer[I2S_BUFFER_SIZE >> 1]), I2S_BUFFER_SIZE >> 1);
 }
+
 extern "C" void HAL_I2S_TxHalfCpltCallback(I2S_HandleTypeDef *hi2s)
 {
   // first half finished, filling it up again while second half is playing
@@ -180,15 +193,10 @@ extern "C" void HAL_MspInit(void) // maybe useful, not included in this example
   /* SysTick_IRQn interrupt configuration */
   HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
 }
-// void initAudio(void)
-// {
 
-// }
 
-// void handleAudio(void)
-// {
 
-// }
+
 
 void initAudio()
 {
@@ -197,15 +205,43 @@ void initAudio()
   MX_DMA_Init();
   MX_I2S3_Init();
   pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(PIN_I2S_SDMODE, OUTPUT);
+  digitalWrite(PIN_I2S_SDMODE, HIGH);
   digitalWrite(LED_BUILTIN, 0);
   StartAudioBuffers(&hi2s3);
   digitalWrite(LED_BUILTIN, 1);
 }
+
+//#define PI 3.14159265358979323846
+#define TAU (2.0 * PI)
+
 void handleAudio()
 {
   // just a dummy code in loop, audio out is generated by ISR
   digitalWrite(LED_BUILTIN, 1);
   delay(250);
+  //HAL_I2S_Transmit(&hi2s3,&sine,WAV_SIZE,1000);
+  HAL_StatusTypeDef res;
+  int16_t signal[46876];
+  int nsamples = sizeof(signal) / sizeof(signal[0]);
+
+  int i = 0;
+  while(i < nsamples) {
+      double t = ((double)i/2.0)/((double)nsamples);
+      signal[i] = 32767*sin(100.0 * TAU * t); // left
+      signal[i+1] = signal[i]; // right
+      i += 2;
+  }
+
+  while(1) {
+      res = HAL_I2S_Transmit(&hi2s3, (uint16_t*)signal, nsamples, HAL_MAX_DELAY);
+      if(res != HAL_OK) {
+          Serial.printf("I2S - ERROR, res = %d!\r\n", res);
+          break;
+      }
+  }
   digitalWrite(LED_BUILTIN, 0);
   delay(250);
+
+
 }
\ No newline at end of file
diff --git a/FW/Leo_muziekdoos_fw/src/audio.h b/FW/Leo_muziekdoos_fw/src/audio.h
index 70f77a5..ac160cc 100644
--- a/FW/Leo_muziekdoos_fw/src/audio.h
+++ b/FW/Leo_muziekdoos_fw/src/audio.h
@@ -3,5 +3,31 @@
 #include "Arduino.h"
 #include "board.h"
 
+#define SAMPLERATE_HZ 44100  // The sample rate of the audio.  Higher sample rates have better fidelity,
+                             // but these tones are so simple it won't make a difference.  44.1khz is
+                             // standard CD quality sound.
+
+#define AMPLITUDE     ((1<<29)-1)   // Set the amplitude of generated waveforms.  This controls how loud
+                             // the signals are, and can be any value from 0 to 2**31 - 1.  Start with
+                             // a low value to prevent damaging speakers!
+
+#define WAV_SIZE      256    // The size of each generated waveform.  The larger the size the higher
+                             // quality the signal.  A size of 256 is more than enough for these simple
+                             // waveforms.
+
+
+// Define the frequency of music notes (from http://www.phy.mtu.edu/~suits/notefreqs.html):
+#define C4_HZ      261.63
+#define D4_HZ      293.66
+#define E4_HZ      329.63
+#define F4_HZ      349.23
+#define G4_HZ      392.00
+#define A4_HZ      440.00
+#define B4_HZ      493.88
+
+// Define a C-major scale to play all the notes up and down.
+float scale[] = { C4_HZ, D4_HZ, E4_HZ, F4_HZ, G4_HZ, A4_HZ, B4_HZ, A4_HZ, G4_HZ, F4_HZ, E4_HZ, D4_HZ, C4_HZ };
+
+
 void initAudio(void);
 void handleAudio(void);
diff --git a/FW/Leo_muziekdoos_fw/src/board.h b/FW/Leo_muziekdoos_fw/src/board.h
index ba24e0b..67e79ee 100644
--- a/FW/Leo_muziekdoos_fw/src/board.h
+++ b/FW/Leo_muziekdoos_fw/src/board.h
@@ -4,4 +4,5 @@
 // #define PIN_I2S_FS      PB12  /* I2S4_WS,     Frame Sync (LRclock)
 // #define PIN_I2S_SCK     PB13  /* I2S4_CLK,    serial Clock */
 // #define PIN_I2S_SD      PA1   /* I2S4_SD,     Serial Data */
-// #define PIN_I2S_SDMODE  PA13  /* DAC_SDMODE,  SDmode HIGH = enabled (left channel), LOW = shutdown */
\ No newline at end of file
+ #define PIN_I2S_SDMODE  PA13  /* DAC_SDMODE,  SDmode HIGH = enabled (left channel), LOW = shutdown */
+
diff --git a/FW/Leo_muziekdoos_fw/src/storage.cpp b/FW/Leo_muziekdoos_fw/src/storage.cpp
index 65fae07..46254d8 100644
--- a/FW/Leo_muziekdoos_fw/src/storage.cpp
+++ b/FW/Leo_muziekdoos_fw/src/storage.cpp
@@ -1,73 +1,73 @@
 #include "storage.h"
 
-Sd2Card card;
-SdFatFs fatFs;
+// Sd2Card card;
+// SdFatFs fatFs;
 
 void initStorage(void)
 {
-  bool disp = false;
-  // Open serial communications and wait for port to open:
-  Serial.begin(9600);
+  // bool disp = false;
+  // // Open serial communications and wait for port to open:
+  // Serial.begin(9600);
 
-  while (!Serial);
-  Serial.print("\nInitializing SD card...");
-  while(!card.init(SD_DETECT_PIN)) {
-    if (!disp) {
-      Serial.println("initialization failed. Is a card inserted?");
-      disp = true;
-    }
-    delay(10);
-  }
+  // while (!Serial);
+  // Serial.print("\nInitializing SD card...");
+  // while(!card.init(SD_DETECT_PIN)) {
+  //   if (!disp) {
+  //     Serial.println("initialization failed. Is a card inserted?");
+  //     disp = true;
+  //   }
+  //   delay(10);
+  // }
 
-  Serial.println("A card is present.");
+  // Serial.println("A card is present.");
 
-  // print the type of card
-  Serial.print("\nCard type: ");
-  switch (card.type()) {
-    case SD_CARD_TYPE_SD1:
-      Serial.println("SD1");
-      break;
-    case SD_CARD_TYPE_SD2:
-      Serial.println("SD2");
-      break;
-    case SD_CARD_TYPE_SDHC:
-      Serial.println("SDHC");
-      break;
-    default:
-      Serial.println("Unknown");
-  }
+  // // print the type of card
+  // Serial.print("\nCard type: ");
+  // switch (card.type()) {
+  //   case SD_CARD_TYPE_SD1:
+  //     Serial.println("SD1");
+  //     break;
+  //   case SD_CARD_TYPE_SD2:
+  //     Serial.println("SD2");
+  //     break;
+  //   case SD_CARD_TYPE_SDHC:
+  //     Serial.println("SDHC");
+  //     break;
+  //   default:
+  //     Serial.println("Unknown");
+  // }
 
-  // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
-  if (!fatFs.init()) {
-    Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
-    return;
-  }
+  // // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
+  // if (!fatFs.init()) {
+  //   Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
+  //   return;
+  // }
 
-  // print the type and size of the first FAT-type volume
-  uint64_t volumesize;
-  Serial.print("\nVolume type is FAT");
-  Serial.println(fatFs.fatType(), DEC);
-  Serial.println();
+  // // print the type and size of the first FAT-type volume
+  // uint64_t volumesize;
+  // Serial.print("\nVolume type is FAT");
+  // Serial.println(fatFs.fatType(), DEC);
+  // Serial.println();
 
-  volumesize = fatFs.blocksPerCluster();    // clusters are collections of blocks
-  volumesize *= fatFs.clusterCount();       // we'll have a lot of clusters
-  volumesize *= 512;                        // SD card blocks are always 512 bytes
-  Serial.print("Volume size (bytes): ");
-  Serial.println(volumesize);
-  Serial.print("Volume size (Kbytes): ");
-  volumesize /= 1024;
-  Serial.println(volumesize);
-  Serial.print("Volume size (Mbytes): ");
-  volumesize /= 1024;
-  Serial.println(volumesize);
+  // volumesize = fatFs.blocksPerCluster();    // clusters are collections of blocks
+  // volumesize *= fatFs.clusterCount();       // we'll have a lot of clusters
+  // volumesize *= 512;                        // SD card blocks are always 512 bytes
+  // Serial.print("Volume size (bytes): ");
+  // Serial.println(volumesize);
+  // Serial.print("Volume size (Kbytes): ");
+  // volumesize /= 1024;
+  // Serial.println(volumesize);
+  // Serial.print("Volume size (Mbytes): ");
+  // volumesize /= 1024;
+  // Serial.println(volumesize);
 
 
-  Serial.println("\nFiles found on the card (name, date and size in bytes): ");
-  File root = SD.openRoot();
+  // Serial.println("\nFiles found on the card (name, date and size in bytes): ");
+  // File root = SD.openRoot();
 
-  // list all files in the card with date and size
-  root.ls(LS_R | LS_DATE | LS_SIZE);
-  Serial.println("###### End of the SD tests ######");
+  // // list all files in the card with date and size
+  // root.ls(LS_R | LS_DATE | LS_SIZE);
+  // Serial.println("###### End of the SD tests ######");
 }
 
 void handleStorage(void) {
diff --git a/FW/Leo_muziekdoos_fw/src/storage.h b/FW/Leo_muziekdoos_fw/src/storage.h
index 8f88499..0928efb 100644
--- a/FW/Leo_muziekdoos_fw/src/storage.h
+++ b/FW/Leo_muziekdoos_fw/src/storage.h
@@ -1,7 +1,7 @@
 #pragma once
 
 // include the SD library:
-#include <STM32SD.h>
+//#include <STM32SD.h>
 
 // If SD card slot has no detect pin then define it as SD_DETECT_NONE
 // to ignore it. One other option is to call 'card.init()' without parameter.