diff --git a/soundcube-firmware/ringbuffer.h b/soundcube-firmware/ringbuffer.h
index 98916cf..decd4b1 100644
--- a/soundcube-firmware/ringbuffer.h
+++ b/soundcube-firmware/ringbuffer.h
@@ -3,21 +3,53 @@
 template<typename T>
 class RingBuffer{
   public:
+    RingBuffer() {}
     RingBuffer(size_t size) : bufferSize(size) {}
-    void begin(){
+
+  void setSize(size_t size) {
+    bufferSize = size;
+  }
+
+	void begin(){
       buffer = new T[bufferSize];
-    };
+    }
 
     bool push(T data){
-      counter++;
-    };
+      if(counter < bufferSize){
+        buffer[write] = data;
+        write = (write+1) % bufferSize;
+        counter++;
+        return true;
+      } 
+      return false;
+    }
     
     T pop(){
-      counter--;
-    };
+      T retval;
+      if(counter > 0) {
+        counter--;
+        retval = buffer[read];
+        read = (read+1) % bufferSize;
+      }
+      return retval;
+    }
+	
+    bool isEmpty(){
+      return counter == 0;
+    }
+
+    bool isFull(){
+      return counter == bufferSize;
+    }
+
+    int size(){
+      return counter;
+    }
+
   private:
     size_t bufferSize = 0;
     int counter = 0;
-    bool 
-    T buffer[];
-}
\ No newline at end of file
+    int write = 0;
+    int read = 0;
+    T *buffer;
+};
diff --git a/soundcube-firmware/soundcube-firmware.ino b/soundcube-firmware/soundcube-firmware.ino
index 740395e..b45b7db 100644
--- a/soundcube-firmware/soundcube-firmware.ino
+++ b/soundcube-firmware/soundcube-firmware.ino
@@ -1,4 +1,3 @@
-#include <RingBuf.h>
 #include <ArduinoJson.h>
 #include <ArduinoJson.hpp>
 
@@ -10,24 +9,28 @@
 #include <SPI.h>
 #include <SD.h>
 #include "codec.h"
+#include "ringbuffer.h"
 
 #define HAPTIC 1
 #define AURAL 1
 #define UI_SAMPLERATE 22050
 
-#define SIZE 256
-#define RINGBUFFER 1024
-#define ECHO 96000
+#define SIZE 1024
+#define RINGBUFFER 16384
+#define ECHO 24000
+
+#define NSTREAMS 4
+
 int16_t buffer[SIZE];
 int16_t buffer2[ECHO];
 
-RingBuf<int16_t, RINGBUFFER> ringbuffer;
+RingBuffer<int16_t> ringbuffer[NSTREAMS];
 
-File stream1;
+File streams[NSTREAMS];
 
 I2S i2s(INPUT_PULLUP);
 
-TLV320AIC3204 codec; 
+TLV320AIC3204 codec;
 
 TCA9555 TCA(0x20, &Wire1);
 AS5600 ENC(&Wire1);
@@ -40,6 +43,12 @@ int lut_ring_cw[48] = {39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,
 int lut_ring_ccw[48] = {40,41,42,43,44,45,46,47,48,49,50,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39};
 int lut_matrix[13] = {56,55,57,58,59,62,61,60,63,64,65,67,66};
 
+int active = 0;
+int active_led_ring = 0;
+
+uint32_t lastTime = 0;
+int32_t position = 0;
+
 CRGB ui_leds[74];
 CRGB edge_leds[11];
 
@@ -95,7 +104,11 @@ void codec_transmit() {
   // }
   
   for(int i = 0; i < count; i++){
-    buffer[i] += ringbuffer.pop();
+    int16_t sample = 0;
+    for(int j = 0; j < NSTREAMS; j++){
+      if(!ringbuffer[j].isEmpty()) sample = ringbuffer[j].pop();
+      buffer[i] += (sample / 4);
+    }
   }
   
   i2s.write((const uint8_t *)&buffer, count * sizeof(int16_t));
@@ -131,7 +144,13 @@ void tca_irq() {
 
 void setup() {
   //Serial.begin();
-  //delay(2000);
+  //delay(1000);
+
+  i2s.setFrequency(48000);
+
+  for(int i = 0; i < NSTREAMS; i++){
+    ringbuffer[i].setSize(RINGBUFFER);
+  }
 
   FastLED.addLeds<NEOPIXEL, 4>(edge_leds, 11);
   FastLED.addLeds<NEOPIXEL, 5>(ui_leds, 74);
@@ -229,26 +248,49 @@ void setup() {
 
   i2s.setBuffers(6, SIZE * sizeof(int16_t) / sizeof(uint32_t));
 
+  for(int i = 0; i < NSTREAMS; i++){
+    ringbuffer[i].begin();
+  }
+
   if(!i2s.begin(48000)){
     Serial.println("I2S error!");
     while(100);
   }
 
-  if(sdInitialized && SD.exists("/piano.wav")) {
-    stream1 = SD.open("/piano.wav");
+  if(sdInitialized) {
+    for(int i = 0; i < NSTREAMS; i++){
+      char filename[40];
+      sprintf(filename, "/sound/%d.wav", i+1);
+      if(SD.exists(filename)){
+        streams[i] = SD.open(filename);
+        streams[i].seek(44, SeekSet);
+      } else {
+        for(int k = 0; k < 3; k++){
+          digitalWrite(6, HIGH);
+          delay(20);
+          digitalWrite(6, LOW);
+          delay(50);
+        }
+      }
+    }
   }
 
+  // if(!ringbuffer.isFull()){
+  //   int cnt = 0;
+  //   while (!ringbuffer.isFull() && cnt < RINGBUFFER) {
+  //     int16_t sample = stream1.read();
+  //     ringbuffer.push(sample);
+  //     if(!stream1.available()) stream1.seek(48000*6, SeekSet); 
+  //     cnt++;
+  //   }
+  // }
+
+
   digitalWrite(6, HIGH);
   delay(50);
   digitalWrite(6, LOW);
 }
 
-int active = 0;
-int active_led_ring = 0;
-
-uint32_t lastTime = 0;
-int32_t position = 0;
-
 void loop() {
   position = ENC.getCumulativePosition();
 
@@ -256,11 +298,18 @@ void loop() {
   if(sd_card_detected) edge_leds[8] = CRGB(0,10,0);
   if(!sd_card_detected) edge_leds[8] = CRGB(10,0,0);
 
-  if(!ringbuffer.isFull()){
-    while (!ringbuffer.isFull()) {
-      int16_t sample = stream1.read();
-      ringbuffer.push(sample);
-      if(!stream1.available()) stream1.seek(0, SeekSet); 
+  for (int i = 0; i < NSTREAMS; i++) {
+    if(!ringbuffer[i].isFull()){
+      int cnt = 0;
+      while (!ringbuffer[i].isFull() && cnt < 10000) {
+        uint8_t samplebyte[2];
+        streams[i].read(samplebyte, 2);
+        if(!streams[i].available()) streams[i].seek(44, SeekSet);
+        
+        int16_t sample = (samplebyte[1] << 8) + samplebyte[0];
+        ringbuffer[i].push(sample);
+        cnt++;
+      }
     }
   }
 
@@ -338,7 +387,7 @@ void loop() {
     ui_leds[lut_ring_ccw[i]] = CRGB(50, 0, 25);
   }
 
-  FastLED.show();
+  //FastLED.show();
   //delay(1); // wait 1ms
 }
 
diff --git a/tools/ringbuffer-test.cpp b/tools/ringbuffer-test.cpp
new file mode 100644
index 0000000..3ae80e0
--- /dev/null
+++ b/tools/ringbuffer-test.cpp
@@ -0,0 +1,18 @@
+#include <iostream>
+#include "ringbuffer.h"
+
+RingBuffer<int16_t> ringbuffer(25);
+
+int main(){
+	ringbuffer.begin();
+
+	for(int j = 0; j < 3; j++){
+		for(int i = 0; i < 15; i++){
+			if(!ringbuffer.isFull()) ringbuffer.push(i);
+		}
+		std::cout << "---" << std::endl;
+		for(int i = 0; i < 25; i++){
+			if(!ringbuffer.isEmpty()) ringbuffer.pop();
+		}
+	}
+}
diff --git a/tools/ringbuffer.h b/tools/ringbuffer.h
new file mode 100644
index 0000000..2d75338
--- /dev/null
+++ b/tools/ringbuffer.h
@@ -0,0 +1,49 @@
+#pragma once
+#include <iostream>
+
+template<typename T>
+class RingBuffer{
+  public:
+    RingBuffer(size_t size) : bufferSize(size) {}
+
+	void begin(){
+      buffer = new T[bufferSize];
+    }
+
+    bool push(T data){
+		std::cout << "write: " << data << std::endl;
+      if(counter < bufferSize){
+        buffer[write] = data;
+        write = (write+1) % bufferSize;
+        counter++;
+        return true;
+      } 
+      return false;
+    }
+    
+    T pop(){
+      T retval;
+      if(counter > 0) {
+        counter--;
+        retval = buffer[read];
+        read = (read+1) % bufferSize;
+      }
+		std::cout << "read: " << retval << std::endl;
+      return retval;
+    }
+	
+	bool isEmpty(){
+		return counter == 0;
+	}
+
+    bool isFull(){
+      return counter == bufferSize;
+    }
+
+  private:
+    size_t bufferSize = 0;
+    int counter = 0;
+    int write = 0;
+    int read = 0;
+    T *buffer;
+};