diff --git a/src/interpreter.cpp b/src/interpreter.cpp
index defcc86..6197eb7 100644
--- a/src/interpreter.cpp
+++ b/src/interpreter.cpp
@@ -208,6 +208,14 @@ void execute_line(int line_index)
 
 void interrupt()
 {
+  if (state.deferred_load_tick == 1) {
+    deferred_load_finish();
+  }
+  if (state.deferred_load_tick > 0) {
+    state.deferred_load_tick -= 1;
+    return;
+  }
+
   if (state.paused)
     return;
 
@@ -297,13 +305,36 @@ void init(float clock_multiplier)
   state.line_index = 0;
   state.pattern_order_table_index = -1;
   next_pattern();
+  for (int ch = 0; ch < 64; ch++) {
+    state.channel[ch].keyon = 0;
+  }
+  state.paused = false;
 
   printf("tick_rate %d\n", state.tick_rate);
 }
 
+void stop_sound()
+{
+  for (int ch = 0; ch < 64; ch++) {
+    wait();
+    bool kyonb = aica_sound.channel[ch].KYONB() != 0;
+    wait(); aica_sound.channel[ch].KYONB(0);
+    wait(); aica_sound.channel[ch].RR(0x1f);
+    state.channel[ch].keyon = kyonb ? 255 : 0;
+  }
+  wait(); aica_sound.channel[0].KYONEX(1);
+}
+
+void resume_sound()
+{
+  for (int ch = 0; ch < 64; ch++) {
+    wait(); aica_sound.channel[ch].RR(0xa);
+  }
+}
+
 void pause()
 {
-  state.tmp_paused = state.paused;
+  stop_sound();
   state.paused = true;
 }
 
@@ -312,9 +343,29 @@ void unpause()
   state.paused = false;
 }
 
-void resume()
+static uint8_t __attribute__((aligned(32))) sample_data[1024 * 1024 * 2];
+const int sample_data_length = (sizeof (sample_data));
+
+void deferred_load(int buf)
 {
-  state.paused = state.tmp_paused;
+  state.deferred_load_tick = 44100 / 2;
+
+  stop_sound();
+
+  const float aica_clock_multiplier = 44.1;
+
+  state.sample_data_ix = xm_init(&interpreter::state.xm,
+                                 buf,
+                                 sample_data,
+                                 sample_data_length);
+  interpreter::init(aica_clock_multiplier);
+}
+
+void deferred_load_finish()
+{
+  sound::transfer(sample_data, state.sample_data_ix);
+
+  resume_sound();
 }
 
 }
diff --git a/src/interpreter.hpp b/src/interpreter.hpp
index 0465282..f70d0cf 100644
--- a/src/interpreter.hpp
+++ b/src/interpreter.hpp
@@ -22,7 +22,9 @@ struct interpreter_state {
   int line_index;
   int next_line_index; // within the current pattern
   bool paused;
-  bool tmp_paused;
+
+  int deferred_load_tick;
+  int sample_data_ix;
 
   struct xm_state xm;
 
@@ -35,4 +37,6 @@ void init(float clock_multiplier);
 void pause();
 void unpause();
 
+void deferred_load(int buf);
+void deferred_load_finish();
 }
diff --git a/src/main.cpp b/src/main.cpp
index a0cb425..d1fba35 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -46,7 +46,7 @@ void vbr600()
       ;
 
     //scene::logo::sound::interrupt();
-    //interpreter::interrupt();
+    interpreter::interrupt();
   } else {
     serial::string("vbr600\n");
     interrupt_exception();
diff --git a/src/playlist.cpp b/src/playlist.cpp
index e078123..555b3ae 100644
--- a/src/playlist.cpp
+++ b/src/playlist.cpp
@@ -1,34 +1,46 @@
+#include "interpreter.hpp"
+#include "sound.hpp"
+#include "playlist.hpp"
+
 #include "xm.h"
 #include "xm/milkypack01.xm.h"
-
-const float aica_clock_multiplier = 44.1;
+#include "xm/CottageFantasy2.xm.h"
 
 namespace playlist {
 
-  static playlist_item playlist[] = {
-    {
-      "milkypack01"
-    }
+  struct state state = {
+    .playlist_ix = -1
   };
 
+  const static playlist_item playlist[] = {
+    {
+      "leon du star",
+      (int)&_binary_xm_milkypack01_xm_start,
+    },
+    {
+      "Shiroiii",
+      (int)&_binary_xm_CottageFantasy2_xm_start,
+    },
+  };
 
-  void load_xm(float clock_multiplier, int buf)
+  const int playlist_length = (sizeof (playlist)) / (sizeof (playlist[0]));
+
+  void next()
   {
-    using namespace interpreter;
+    state.playlist_ix += 1;
+    if (state.playlist_ix >= playlist_length)
+      state.playlist_ix = 0;
 
-    static uint8_t __attribute__((aligned(32))) sample_data[1024 * 1024 * 2];
-    const int sample_data_length = (sizeof (sample_data));
+    printf("deferred_load\n");
+    interpreter::deferred_load(playlist[state.playlist_ix].start);
+  }
 
-    interpreter::pause();
+  void prev()
+  {
+    state.playlist_ix -= 1;
+    if (state.playlist_ix < 0)
+      state.playlist_ix = playlist_length - 1;
 
-    int sample_data_ix = xm_init(&state.xm,
-                                 buf,
-                                 sample_data,
-                                 sample_data_length);
-    interpreter::init(clock_multiplier);
-    sound::transfer(sample_data, sample_data_ix);
-    //printf("tick_rate %d\n", state.tick_rate);
-
-    interpreter::resume();
+    interpreter::deferred_load(playlist[state.playlist_ix].start);
   }
 }
diff --git a/src/playlist.hpp b/src/playlist.hpp
index 6c304aa..d8c413d 100644
--- a/src/playlist.hpp
+++ b/src/playlist.hpp
@@ -1,6 +1,17 @@
+#pragma once
+
 namespace playlist {
   struct playlist_item {
-    const char * const name;
+    const char * const artist;
     const int start;
   };
+
+  struct state {
+    int playlist_ix;
+  };
+
+  void next();
+  void prev();
+
+  extern struct state state;
 }
diff --git a/src/scene/tracker/scene.cpp b/src/scene/tracker/scene.cpp
index 27af01b..08246a1 100644
--- a/src/scene/tracker/scene.cpp
+++ b/src/scene/tracker/scene.cpp
@@ -10,19 +10,28 @@
 #include "widget/button.hpp"
 #include "widget/left_aligned.hpp"
 #include "widget/top_aligned.hpp"
+#include "playlist.hpp"
+#include "interpreter.hpp"
 
 #include "cursor.hpp"
 
 void prev_click()
 {
   printf("prev\n");
+  playlist::prev();
+}
+
+void next_click()
+{
+  printf("next\n");
+  playlist::prev();
 }
 
 widget::button prev_button(50, 50, "prev", prev_click);
 widget::button play_button(50, 50, "play");
 widget::button pause_button(50, 50, "pause");
 widget::button stop_button(50, 50, "stop");
-widget::button next_button(50, 50, "next");
+widget::button next_button(50, 50, "next", next_click);
 
 widget::widget * left1_children[] = {
   &prev_button,
@@ -75,6 +84,7 @@ namespace scene::tracker {
   void init()
   {
     top.freeze(0, 0);
+    playlist::next();
   }
 
   void update()
diff --git a/xm/CottageFantasy2.xm b/xm/CottageFantasy2.xm
new file mode 100644
index 0000000..67e836a
Binary files /dev/null and b/xm/CottageFantasy2.xm differ
diff --git a/xm/CottageFantasy2.xm.h b/xm/CottageFantasy2.xm.h
new file mode 100644
index 0000000..038316a
--- /dev/null
+++ b/xm/CottageFantasy2.xm.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_xm_CottageFantasy2_xm_start __asm("_binary_xm_CottageFantasy2_xm_start");
+extern uint32_t _binary_xm_CottageFantasy2_xm_end __asm("_binary_xm_CottageFantasy2_xm_end");
+extern uint32_t _binary_xm_CottageFantasy2_xm_size __asm("_binary_xm_CottageFantasy2_xm_size");
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/xm/milkypack01.xm b/xm/milkypack01.xm
index 7bc7008..84d6531 100644
Binary files a/xm/milkypack01.xm and b/xm/milkypack01.xm differ
diff --git a/xm_player.mk b/xm_player.mk
index 3cec341..c421959 100644
--- a/xm_player.mk
+++ b/xm_player.mk
@@ -1,5 +1,6 @@
 XM_OBJ = \
-	xm/milkypack01.xm.o
+	xm/milkypack01.xm.o \
+	xm/CottageFantasy2.xm.o
 
 TEXTURE_OBJ = \
 	font/tandy1k.data.o \
@@ -28,6 +29,7 @@ XM_PLAYER_OBJ = \
 	src/interpreter.o \
 	src/main.o \
 	src/malloc.o \
+	src/playlist.o \
 	src/scene/logo/scene.o \
 	src/scene/logo/sound.o \
 	src/scene/scene.o \