diff --git a/.settings/stm32cubeide.project.prefs b/.settings/stm32cubeide.project.prefs
index 9631d28..78851cb 100644
--- a/.settings/stm32cubeide.project.prefs
+++ b/.settings/stm32cubeide.project.prefs
@@ -1,5 +1,5 @@
 635E684B79701B039C64EA45C3F84D30=786B3C9175F8FD59BE24144A9C2C0972
 66BE74F758C12D739921AEA421D593D3=0
-8DF89ED150041C4CBC7CB9A9CAA90856=AB300AAF2E04A330B7C06C41BF25F205
-DC22A860405A8BF2F2C095E5B6529F12=AB300AAF2E04A330B7C06C41BF25F205
+8DF89ED150041C4CBC7CB9A9CAA90856=93686BBC250D6AB1A1396FED176FCE30
+DC22A860405A8BF2F2C095E5B6529F12=93686BBC250D6AB1A1396FED176FCE30
 eclipse.preferences.version=1
diff --git a/Core/Src/Components/Start.cpp b/Core/Src/Components/Start.cpp
index a63a517..6eff501 100644
--- a/Core/Src/Components/Start.cpp
+++ b/Core/Src/Components/Start.cpp
@@ -10,15 +10,8 @@
 
 #include "AUDIO.h"
 
-uint16_t pBuffer[200];
-
 void Start(){
-	for(uint32_t i = 0; i<100; i++){
-			pBuffer[2*i] = i*655;
-			pBuffer[(2*i)+1] = 32768;
-	}
-	AUDIO_OUT_Init(2, 35, 96000);
-	AUDIO_OUT_Play(pBuffer, 400);
+	AUDIO_OUT_Init(2, 100, 48000);
 	while(1){
 
 	}
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 0caaa6c..b943b31 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -146,12 +146,11 @@ void SystemClock_Config(void)
   /** Initializes the RCC Oscillators according to the specified parameters
   * in the RCC_OscInitTypeDef structure.
   */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
-  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
-  RCC_OscInitStruct.PLL.PLLM = 8;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = 4;
   RCC_OscInitStruct.PLL.PLLN = 192;
   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
   RCC_OscInitStruct.PLL.PLLQ = 8;
@@ -187,7 +186,7 @@ void PeriphCommonClock_Config(void)
   */
   PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S;
   PeriphClkInitStruct.PLLI2S.PLLI2SN = 200;
-  PeriphClkInitStruct.PLLI2S.PLLI2SM = 10;
+  PeriphClkInitStruct.PLLI2S.PLLI2SM = 5;
   PeriphClkInitStruct.PLLI2S.PLLI2SR = 2;
   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
   {
@@ -283,7 +282,7 @@ static void MX_I2S3_Init(void)
   hi2s3.Init.Standard = I2S_STANDARD_PHILIPS;
   hi2s3.Init.DataFormat = I2S_DATAFORMAT_16B;
   hi2s3.Init.MCLKOutput = I2S_MCLKOUTPUT_ENABLE;
-  hi2s3.Init.AudioFreq = I2S_AUDIOFREQ_96K;
+  hi2s3.Init.AudioFreq = I2S_AUDIOFREQ_48K;
   hi2s3.Init.CPOL = I2S_CPOL_LOW;
   hi2s3.Init.ClockSource = I2S_CLOCK_PLL;
   hi2s3.Init.FullDuplexMode = I2S_FULLDUPLEXMODE_DISABLE;
diff --git a/F411-DMA-Audio.ioc b/F411-DMA-Audio.ioc
index ee0e2c2..e03d675 100644
--- a/F411-DMA-Audio.ioc
+++ b/F411-DMA-Audio.ioc
@@ -35,12 +35,13 @@ I2S2.IPParameters=FullDuplexMode,ErrorAudioFreq,RealAudioFreq,AudioFreq,Instance
 I2S2.Instance=SPI$Index
 I2S2.RealAudioFreq=96.153 KHz
 I2S2.VirtualMode=I2S_MODE_MASTER
-I2S3.AudioFreq=I2S_AUDIOFREQ_96K
-I2S3.ErrorAudioFreq=-6.99 %
+I2S3.AudioFreq=I2S_AUDIOFREQ_48K
+I2S3.AudioFreqCustom=48000
+I2S3.ErrorAudioFreq=0.15 %
 I2S3.FullDuplexMode=I2S_FULLDUPLEXMODE_DISABLE
-I2S3.IPParameters=AudioFreq,ErrorAudioFreq,RealAudioFreq,Instance,VirtualMode,FullDuplexMode
+I2S3.IPParameters=AudioFreq,ErrorAudioFreq,RealAudioFreq,Instance,VirtualMode,FullDuplexMode,AudioFreqCustom
 I2S3.Instance=SPI$Index
-I2S3.RealAudioFreq=89.285 KHz
+I2S3.RealAudioFreq=48.076 KHz
 I2S3.VirtualMode=I2S_MODE_MASTER
 KeepUserPlacement=false
 Mcu.CPN=STM32F411VET6
@@ -309,10 +310,12 @@ PE5.Signal=GPXTI5
 PH0\ -\ OSC_IN.GPIOParameters=GPIO_Label
 PH0\ -\ OSC_IN.GPIO_Label=PH0-OSC_IN
 PH0\ -\ OSC_IN.Locked=true
+PH0\ -\ OSC_IN.Mode=HSE-External-Oscillator
 PH0\ -\ OSC_IN.Signal=RCC_OSC_IN
 PH1\ -\ OSC_OUT.GPIOParameters=GPIO_Label
 PH1\ -\ OSC_OUT.GPIO_Label=PH1-OSC_OUT
 PH1\ -\ OSC_OUT.Locked=true
+PH1\ -\ OSC_OUT.Mode=HSE-External-Oscillator
 PH1\ -\ OSC_OUT.Signal=RCC_OSC_OUT
 PinOutPanel.RotationAngle=0
 ProjectManager.AskForMigrate=true
@@ -327,7 +330,7 @@ ProjectManager.DeviceId=STM32F411VETx
 ProjectManager.FirmwarePackage=STM32Cube FW_F4 V1.27.0
 ProjectManager.FreePins=false
 ProjectManager.HalAssertFull=false
-ProjectManager.HeapSize=0x200
+ProjectManager.HeapSize=0x2000
 ProjectManager.KeepUserCode=true
 ProjectManager.LastFirmware=true
 ProjectManager.LibraryCopy=1
@@ -338,7 +341,7 @@ ProjectManager.ProjectBuild=false
 ProjectManager.ProjectFileName=F411-DMA-Audio.ioc
 ProjectManager.ProjectName=F411-DMA-Audio
 ProjectManager.RegisterCallBack=
-ProjectManager.StackSize=0x400
+ProjectManager.StackSize=0x4000
 ProjectManager.TargetToolchain=STM32CubeIDE
 ProjectManager.ToolChainLocation=
 ProjectManager.UnderRoot=true
@@ -358,17 +361,16 @@ RCC.HCLKFreq_Value=96000000
 RCC.HSE_VALUE=8000000
 RCC.HSI_VALUE=16000000
 RCC.I2SClocksFreq_Value=160000000
-RCC.IPParameters=48MHZClocksFreq_Value,AHBFreq_Value,APB1CLKDivider,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,EthernetFreq_Value,FCLKCortexFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI_VALUE,I2SClocksFreq_Value,LSI_VALUE,MCO2PinFreq_Value,PLLCLKFreq_Value,PLLI2SM,PLLI2SN,PLLM,PLLP,PLLQ,PLLQCLKFreq_Value,PLLSourceVirtualString,RTCFreq_Value,RTCHSEDivFreq_Value,SYSCLKFreq_VALUE,SYSCLKSource,VCOI2SOutputFreq_Value,VCOInputFreq_Value,VCOInputMFreq_Value,VCOOutputFreq_Value,VcooutputI2S
+RCC.IPParameters=48MHZClocksFreq_Value,AHBFreq_Value,APB1CLKDivider,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,EthernetFreq_Value,FCLKCortexFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI_VALUE,I2SClocksFreq_Value,LSI_VALUE,MCO2PinFreq_Value,PLLCLKFreq_Value,PLLI2SM,PLLI2SN,PLLM,PLLP,PLLQ,PLLQCLKFreq_Value,RTCFreq_Value,RTCHSEDivFreq_Value,SYSCLKFreq_VALUE,SYSCLKSource,VCOI2SOutputFreq_Value,VCOInputFreq_Value,VCOInputMFreq_Value,VCOOutputFreq_Value,VcooutputI2S
 RCC.LSI_VALUE=32000
 RCC.MCO2PinFreq_Value=96000000
 RCC.PLLCLKFreq_Value=96000000
-RCC.PLLI2SM=10
+RCC.PLLI2SM=5
 RCC.PLLI2SN=200
-RCC.PLLM=8
+RCC.PLLM=4
 RCC.PLLP=RCC_PLLP_DIV4
 RCC.PLLQ=8
 RCC.PLLQCLKFreq_Value=48000000
-RCC.PLLSourceVirtualString=RCC_PLLSOURCE_HSI
 RCC.RTCFreq_Value=32000
 RCC.RTCHSEDivFreq_Value=4000000
 RCC.SYSCLKFreq_VALUE=96000000
@@ -394,7 +396,7 @@ SPI1.Mode=SPI_MODE_MASTER
 SPI1.VirtualType=VM_MASTER
 USB_DEVICE.CLASS_NAME_FS=AUDIO
 USB_DEVICE.IPParameters=VirtualMode,VirtualModeFS,CLASS_NAME_FS,USBD_AUDIO_FREQ
-USB_DEVICE.USBD_AUDIO_FREQ=44100
+USB_DEVICE.USBD_AUDIO_FREQ=48000
 USB_DEVICE.VirtualMode=Audio
 USB_DEVICE.VirtualModeFS=Audio_FS
 USB_OTG_FS.IPParameters=VirtualMode
diff --git a/STM32F411VETX_FLASH.ld b/STM32F411VETX_FLASH.ld
index 919c450..c657e32 100644
--- a/STM32F411VETX_FLASH.ld
+++ b/STM32F411VETX_FLASH.ld
@@ -38,8 +38,8 @@ ENTRY(Reset_Handler)
 /* Highest address of the user mode stack */
 _estack = ORIGIN(RAM) + LENGTH(RAM); /* end of "RAM" Ram type memory */
 
-_Min_Heap_Size = 0x200 ; /* required amount of heap */
-_Min_Stack_Size = 0x400 ; /* required amount of stack */
+_Min_Heap_Size = 0x2000 ; /* required amount of heap */
+_Min_Stack_Size = 0x4000 ; /* required amount of stack */
 
 /* Memories definition */
 MEMORY
diff --git a/USB_DEVICE/App/usbd_audio_if.c b/USB_DEVICE/App/usbd_audio_if.c
index 2f2e87d..c92a861 100644
--- a/USB_DEVICE/App/usbd_audio_if.c
+++ b/USB_DEVICE/App/usbd_audio_if.c
@@ -31,7 +31,6 @@
 
 /* USER CODE BEGIN PV */
 /* Private variables ---------------------------------------------------------*/
-
 /* USER CODE END PV */
 
 /** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
@@ -186,9 +185,11 @@ static int8_t AUDIO_AudioCmd_FS(uint8_t* pbuf, uint32_t size, uint8_t cmd)
   switch(cmd)
   {
     case AUDIO_CMD_START:
+    	AUDIO_OUT_Play(pbuf, 2*size);
     break;
 
     case AUDIO_CMD_PLAY:
+
     break;
   }
   UNUSED(pbuf);
diff --git a/USB_DEVICE/Target/usbd_conf.h b/USB_DEVICE/Target/usbd_conf.h
index 15a5207..2ef981a 100644
--- a/USB_DEVICE/Target/usbd_conf.h
+++ b/USB_DEVICE/Target/usbd_conf.h
@@ -75,7 +75,7 @@
 /*---------- -----------*/
 #define USBD_SELF_POWERED     1U
 /*---------- -----------*/
-#define USBD_AUDIO_FREQ     44100U
+#define USBD_AUDIO_FREQ     48000U
 
 /****************************************/
 /* #define for FS and HS identification */