diff --git a/modules/NIGHTDLL/nt_sound.c b/modules/NIGHTDLL/nt_sound.c
index cca4817..c444977 100644
--- a/modules/NIGHTDLL/nt_sound.c
+++ b/modules/NIGHTDLL/nt_sound.c
@@ -23,7 +23,6 @@ void nt_voice_set(int no) {
 }
 
 void nt_cd_play(int no) {
-	mus_cdrom_stop();
 	mus_cdrom_start(no +1, 0);
 }
 
diff --git a/src/cmds.c b/src/cmds.c
index ac4637b..ae31f7d 100644
--- a/src/cmds.c
+++ b/src/cmds.c
@@ -37,21 +37,16 @@ static int next_cdrom_loopcnt = 0;
 void commandSS() {
 	/* 音楽演奏を開始する（ＣＤのみ）*/
 	int num = getCaliValue();
-	static int pre = 0;
 	
 	DEBUG_COMMAND("SS %d:\n",num);
 	
 	if (num == 0) {
 		mus_cdrom_stop();
 	} else {
-		if (pre != num) {
-			mus_cdrom_stop();
-			mus_cdrom_start(num + 1, next_cdrom_loopcnt);
-		}
+		mus_cdrom_start(num + 1, next_cdrom_loopcnt);
 	}
 	
 	next_cdrom_loopcnt = 0;
-	pre = num;
 }
 
 void commandSC() {
diff --git a/src/music.c b/src/music.c
index 21a5a96..061f3f3 100644
--- a/src/music.c
+++ b/src/music.c
@@ -57,9 +57,7 @@ void mus_reset(void) {
  */
 int mus_cdrom_start(int track, int loop) {
 	if (!prv.cd_valid) return NG;
-	muscd_start(track, loop);
-	muscd_cb();
-	return OK;
+	return muscd_start(track, loop);
 }
 
 /*
@@ -67,9 +65,7 @@ int mus_cdrom_start(int track, int loop) {
  */
 int mus_cdrom_stop() {
 	if (!prv.cd_valid) return NG;
-	muscd_stop();
-	muscd_cb();
-	return OK;
+	return muscd_stop();
 }
 
 /*
diff --git a/src/music_cdrom.c b/src/music_cdrom.c
index ce3d068..5fc4ff9 100644
--- a/src/music_cdrom.c
+++ b/src/music_cdrom.c
@@ -29,30 +29,15 @@
 #include "music_cdrom.h"
 #include "cdrom.h"
 
-enum {
-	CDROM_START,
-	CDROM_STOPCHECK,
-	CDROM_LOOPCHECK,
-	CDROM_STOP,
-	CDROM_NOP
-};
-
 int muscd_init(void) {
 	int st = cd_init(&prv.cddev);
-	int ret;
-	
 	if (st == -1) {
 		prv.cd_valid = FALSE;
-		ret = NG;
-	} else {
-		prv.cd_valid = TRUE;
-		prv.cdrom.dev = &prv.cddev;
-		prv.cdrom.st = CDROM_NOP;
-		prv.cdrom.in_play = FALSE;
-		ret = OK;
+		return NG;
 	}
-	
-	return ret;
+	prv.cd_valid = TRUE;
+	prv.cd_current_track = 0;
+	return OK;
 }
 
 int muscd_exit(void) {
@@ -65,67 +50,27 @@ int muscd_exit(void) {
 int muscd_reset(void) {
 	if (prv.cd_valid) {
 		prv.cddev.reset();
+		prv.cd_current_track = 0;
 	}
 	return OK;
 }
 
 int muscd_start(int trk, int loop) {
-	prv.cdrom.track = trk;
-	prv.cdrom.loop = loop;
-	prv.cdrom.cnt = 0;
-	
-	prv.cdrom.st = CDROM_START;
-	prv.cdrom.in_play = FALSE;
-	
-	memset(&prv.cdrom.time, 0, sizeof(cd_time));
-	
+	if (trk == prv.cd_current_track)
+		return OK;
+	prv.cddev.stop();
+
+	prv.cddev.start(trk, loop);
+	prv.cd_current_track = trk;
 	return OK;
 }
 
 int muscd_stop(void) {
-	prv.cdrom.st = CDROM_STOP;
+	prv.cddev.stop();
+	prv.cd_current_track = 0;
 	return OK;
 }
 
 int muscd_getpos(cd_time *tm) {
 	return prv.cddev.getpos(tm);
 }
-
-int muscd_cb(void) {
-	cdobj_t *obj = &prv.cdrom;
-	
-	switch(obj->st) {
-	case CDROM_START:
-		obj->in_play = TRUE;
-		obj->dev->start(obj->track, obj->loop);
-		obj->st = CDROM_STOPCHECK;
-		break;
-	case CDROM_STOPCHECK:
-		if (NG == obj->dev->getpos(&(obj->time))) {
-                        obj->st = CDROM_LOOPCHECK;
-                }
-		break;
-	case CDROM_LOOPCHECK:
-		obj->cnt++;
-		if (obj->loop == 0) {
-			obj->st = CDROM_START;
-			break;
-		}
-		if (--obj->loop == 0) {
-			obj->st = CDROM_STOP;
-		} else {
-			obj->st = CDROM_START;
-		}
-                break;
-	case CDROM_STOP:
-                obj->dev->stop();
-                
-                obj->in_play = FALSE;
-                obj->st = CDROM_NOP;
-                break;
-        case CDROM_NOP:
-                break;
-	}
-	
-	return OK;
-}
diff --git a/src/music_cdrom.h b/src/music_cdrom.h
index a541ea5..36b5bda 100644
--- a/src/music_cdrom.h
+++ b/src/music_cdrom.h
@@ -27,27 +27,11 @@
 #include "portab.h"
 #include "cdrom.h"
 
-struct _cdobj {
-	int st; // オブジェクトの遷移状態
-
-	int track; // 演奏トラック
-	int loop;  // くりかえし数 (0の場合は無限)
-	int cnt;   // 実際に繰り返した数
-	
-	boolean in_play; // 演奏中？
-        
-	cd_time time; // 演奏位置
-	
-	cdromdevice_t *dev;
-};
-typedef struct _cdobj cdobj_t;
-
 int muscd_init(void);
 int muscd_exit(void);
 int muscd_reset(void);
 int muscd_start(int trk, int loop);
 int muscd_stop(void);
 int muscd_getpos(cd_time *tm);
-int muscd_cb(void);
 
 #endif /* __MUSIC_CDROM_H__ */
diff --git a/src/music_private.h b/src/music_private.h
index d5f5e7c..6083d2b 100644
--- a/src/music_private.h
+++ b/src/music_private.h
@@ -38,7 +38,6 @@ struct _musprvdat {
 	cdromdevice_t cddev;
 	mididevice_t  mididev;
 	
-	cdobj_t cdrom;   // cdrom object
 	midiobj_t midi;  // midi object
 	
 	// ゲーム内での volume 設定 (%値)
@@ -49,8 +48,8 @@ struct _musprvdat {
 	int vol_pcm_sub[128 + 1 + 2]; // volval の channel
 	int volval[16]; // 各channel 毎の volume valance
 	
-	// 最大トラック数
 	int cd_maxtrk;
+	int cd_current_track;
 };
 
 #define prv musprv