diff --git a/sys/dev/sound/midi/timer.c b/sys/dev/sound/midi/timer.c
new file mode 100644
index 000000000000..969153ee1976
--- /dev/null
+++ b/sys/dev/sound/midi/timer.c
@@ -0,0 +1,564 @@
+/*
+ * This is the timer engine of /dev/music for FreeBSD.
+ * 
+ * (C) 2002 Seigo Tanimura
+ * 
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials provided
+ *    with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS
+ * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ */
+
+#include <dev/sound/midi/midi.h>
+#include <dev/sound/midi/sequencer.h>
+
+#define TMR2TICKS(scp, tmr_val)	\
+	((((tmr_val) * (scp)->tempo * (scp)->timebase) + (30 * hz)) / (60 * hz))
+#define CURTICKS(scp)	\
+	((scp)->ticks_offset + (scp)->ticks_cur - (scp)->ticks_base)
+
+struct systmr_timer_softc {
+	int	running;
+
+	u_long	ticks_offset;
+	u_long	ticks_base;
+	u_long	ticks_cur;
+
+	int	tempo;
+	int	timebase;
+
+	u_long	nexteventtime;
+	u_long	preveventtime;
+
+	struct callout	timer;
+};
+
+static timeout_t	systmr_timer;
+static void		systmr_reset(timerdev_info *tmd);
+static u_long		systmr_time(void);
+
+static tmr_open_t	systmr_open;
+static tmr_close_t	systmr_close;
+static tmr_event_t	systmr_event;
+static tmr_gettime_t	systmr_gettime;
+static tmr_ioctl_t	systmr_ioctl;
+static tmr_armtimer_t	systmr_armtimer;
+
+static timerdev_info systmr_timerdev = {
+	"System clock",
+	0,
+	0,
+	systmr_open,
+	systmr_close,
+	systmr_event,
+	systmr_gettime,
+	systmr_ioctl,
+	systmr_armtimer,
+};
+
+static TAILQ_HEAD(,_timerdev_info) timer_info;
+static struct mtx timerinfo_mtx;
+static int timerinfo_mtx_init;
+static int ntimer;
+
+
+/* Install a system timer. */
+int
+timerdev_install(void)
+{
+	int ret;
+	timerdev_info *tmd;
+	struct systmr_timer_softc *scp;
+
+	SEQ_DEBUG(printf("timerdev_install: install a new timer.\n"));
+
+	ret = 0;
+	tmd = NULL;
+	scp = NULL;
+
+	scp = malloc(sizeof(*scp), M_DEVBUF, M_WAITOK | M_ZERO);
+	if (scp == NULL) {
+		ret = ENOMEM;
+		goto fail;
+	}
+
+	tmd = create_timerdev_info_unit(&systmr_timerdev);
+	if (tmd == NULL) {
+		ret = ENOMEM;
+		goto fail;
+	}
+
+	tmd->softc = scp;
+	callout_init(&scp->timer, 0);
+
+	mtx_unlock(&tmd->mtx);
+
+	SEQ_DEBUG(printf("timerdev_install: installed a new timer, unit %d.\n", tmd->unit));
+
+	return (0);
+
+fail:
+	if (scp != NULL)
+		free(scp, M_DEVBUF);
+	if (tmd != NULL) {
+		TAILQ_REMOVE(&timer_info, tmd, tmd_link);
+		free(tmd, M_DEVBUF);
+	}
+
+	SEQ_DEBUG(printf("timerdev_install: installation failed.\n"));
+
+	return (ret);
+}
+
+/* Create a new timer device info structure. */
+timerdev_info *
+create_timerdev_info_unit(timerdev_info *tmdinf)
+{
+	int unit;
+	timerdev_info *tmd, *tmdnew;
+
+	/* XXX */
+	if (!timerinfo_mtx_init) {
+		timerinfo_mtx_init = 1;
+		mtx_init(&timerinfo_mtx, "tmrinf", MTX_DEF);
+		TAILQ_INIT(&timer_info);
+	}
+
+	/* As malloc(9) might block, allocate timerdev_info now. */
+	tmdnew = malloc(sizeof(timerdev_info), M_DEVBUF, M_WAITOK | M_ZERO);
+	if (tmdnew == NULL)
+		return NULL;
+	bcopy(tmdinf, tmdnew, sizeof(timerdev_info));
+	mtx_init(&tmdnew->mtx, "tmrmtx", MTX_DEF);
+
+	mtx_lock(&timerinfo_mtx);
+
+	ntimer++;
+
+	for (unit = 0 ; ; unit++) {
+		TAILQ_FOREACH(tmd, &timer_info, tmd_link) {
+			if (tmd->unit == unit)
+				break;
+		}
+		if (tmd == NULL)
+			break;
+	}
+
+	tmdnew->unit = unit;
+	mtx_lock(&tmdnew->mtx);
+	tmd = TAILQ_FIRST(&timer_info);
+	while (tmd != NULL) {
+		if (tmd->prio < tmdnew->prio)
+			break;
+		tmd = TAILQ_NEXT(tmd, tmd_link);
+	}
+	if (tmd != NULL)
+		TAILQ_INSERT_BEFORE(tmd, tmdnew, tmd_link);
+	else
+		TAILQ_INSERT_TAIL(&timer_info, tmdnew, tmd_link);
+
+	mtx_unlock(&timerinfo_mtx);
+
+	return (tmdnew);
+}
+
+/*
+ * a small utility function which, given a unit number, returns
+ * a pointer to the associated timerdev_info struct.
+ */
+timerdev_info *
+get_timerdev_info_unit(int unit)
+{
+	timerdev_info *tmd;
+
+	/* XXX */
+	if (!timerinfo_mtx_init) {
+		timerinfo_mtx_init = 1;
+		mtx_init(&timerinfo_mtx, "tmrinf", MTX_DEF);
+		TAILQ_INIT(&timer_info);
+	}
+
+	mtx_lock(&timerinfo_mtx);
+	TAILQ_FOREACH(tmd, &timer_info, tmd_link) {
+		mtx_lock(&tmd->mtx);
+		if (tmd->unit == unit && tmd->seq == NULL)
+			break;
+		mtx_unlock(&tmd->mtx);
+	}
+	mtx_unlock(&timerinfo_mtx);
+
+	return tmd;
+}
+
+/*
+ * a small utility function which returns a pointer
+ * to the best preferred timerdev_info struct with
+ * no sequencer.
+ */
+timerdev_info *
+get_timerdev_info(void)
+{
+	timerdev_info *tmd;
+
+	/* XXX */
+	if (!timerinfo_mtx_init) {
+		timerinfo_mtx_init = 1;
+		mtx_init(&timerinfo_mtx, "tmrinf", MTX_DEF);
+		TAILQ_INIT(&timer_info);
+	}
+
+	mtx_lock(&timerinfo_mtx);
+	TAILQ_FOREACH(tmd, &timer_info, tmd_link) {
+		mtx_lock(&tmd->mtx);
+		if (tmd->seq == NULL)
+			break;
+		mtx_unlock(&tmd->mtx);
+	}
+	mtx_unlock(&timerinfo_mtx);
+
+	return tmd;
+}
+
+
+/* ARGSUSED */
+static void
+systmr_timer(void *d)
+{
+	timerdev_info *tmd;
+	struct systmr_timer_softc *scp;
+	void *seq;
+
+	tmd = (timerdev_info *)d;
+	scp = (struct systmr_timer_softc *)tmd->softc;
+	seq = NULL;
+
+	mtx_lock(&tmd->mtx);
+
+	if (tmd->opened) {
+		callout_reset(&scp->timer, 1, systmr_timer, tmd);
+
+		if (scp->running) {
+			scp->ticks_cur = TMR2TICKS(scp, systmr_time());
+
+			if (CURTICKS(scp) >= scp->nexteventtime) {
+				SEQ_DEBUG(printf("systmr_timer: CURTICKS %lu, call the sequencer.\n", CURTICKS(scp)));
+				scp->nexteventtime = ULONG_MAX;
+				seq = tmd->seq;
+			}
+		}
+	}
+
+	mtx_unlock(&tmd->mtx);
+
+	if (seq != NULL)
+		seq_timer(seq);
+}
+
+static void
+systmr_reset(timerdev_info *tmd)
+{
+	struct systmr_timer_softc *scp;
+
+	scp = (struct systmr_timer_softc *)tmd->softc;
+
+	mtx_assert(&tmd->mtx, MA_OWNED);
+
+	SEQ_DEBUG(printf("systmr_reset: unit %d.\n", tmd->unit));
+
+	scp->ticks_offset = 0;
+	scp->ticks_base = scp->ticks_cur = TMR2TICKS(scp, systmr_time());
+
+	scp->nexteventtime = ULONG_MAX;
+	scp->preveventtime = 0;
+}
+
+static u_long
+systmr_time(void)
+{
+	struct timeval  timecopy;
+
+	getmicrotime(&timecopy);
+	return timecopy.tv_usec / (1000000 / hz) + (u_long) timecopy.tv_sec * hz;
+}
+
+
+/* ARGSUSED */
+static int
+systmr_open(timerdev_info *tmd, int oflags, int devtype, struct thread *td)
+{
+	struct systmr_timer_softc *scp;
+
+	scp = (struct systmr_timer_softc *)tmd->softc;
+
+	SEQ_DEBUG(printf("systmr_open: unit %d.\n", tmd->unit));
+
+	mtx_lock(&tmd->mtx);
+
+	if (tmd->opened) {
+		mtx_unlock(&tmd->mtx);
+		return (EBUSY);
+	}
+
+	systmr_reset(tmd);
+	scp->tempo = 60;
+	scp->timebase = hz;
+	tmd->opened = 1;
+
+	callout_reset(&scp->timer, 1, systmr_timer, tmd);
+
+	mtx_unlock(&tmd->mtx);
+
+	return (0);
+}
+
+static int
+systmr_close(timerdev_info *tmd, int fflag, int devtype, struct thread *td)
+{
+	struct systmr_timer_softc *scp;
+
+	scp = (struct systmr_timer_softc *)tmd->softc;
+
+	SEQ_DEBUG(printf("systmr_close: unit %d.\n", tmd->unit));
+
+	mtx_lock(&tmd->mtx);
+
+	tmd->opened = 0;
+	scp->running = 0;
+
+	callout_stop(&scp->timer);
+
+	mtx_unlock(&tmd->mtx);
+
+	return (0);
+}
+
+static int
+systmr_event(timerdev_info *tmd, u_char *ev)
+{
+	struct systmr_timer_softc	*scp;
+	u_char	cmd;
+	u_long	parm, t;
+	int	ret;
+	void *	seq;
+
+	scp = (struct systmr_timer_softc *)tmd->softc;
+	cmd = ev[1];
+	parm = *(int *)&ev[4];
+	ret = MORE;
+
+	SEQ_DEBUG(printf("systmr_event: unit %d, cmd %s, parm %lu.\n",
+			 tmd->unit, midi_cmdname(cmd, cmdtab_timer), parm));
+
+	mtx_lock(&tmd->mtx);
+
+	switch (cmd) {
+	case TMR_WAIT_REL:
+		parm += scp->preveventtime;
+		/* FALLTHRU */
+	case TMR_WAIT_ABS:
+		if (parm > 0) {
+			if (parm <= CURTICKS(scp))
+				break;
+			t = parm;
+			scp->nexteventtime = scp->preveventtime = t;
+			ret = TIMERARMED;
+			break;
+		}
+		break;
+
+	case TMR_START:
+		systmr_reset(tmd);
+		scp->running = 1;
+		break;
+
+	case TMR_STOP:
+		scp->running = 0;
+		break;
+
+	case TMR_CONTINUE:
+		scp->running = 1;
+		break;
+
+	case TMR_TEMPO:
+		if (parm > 0) {
+			RANGE(parm, 8, 360);
+			scp->ticks_offset += scp->ticks_cur
+			    - scp->ticks_base;
+			scp->ticks_base = scp->ticks_cur;
+			scp->tempo = parm;
+		}
+		break;
+
+	case TMR_ECHO:
+		seq = tmd->seq;
+		mtx_unlock(&tmd->mtx);
+		seq_copytoinput(seq, ev, 8);
+		mtx_lock(&tmd->mtx);
+		break;
+	}
+
+	mtx_unlock(&tmd->mtx);
+
+	SEQ_DEBUG(printf("systmr_event: timer %s.\n",
+			 ret == TIMERARMED ? "armed" : "not armed"));
+
+	return (ret);
+}
+
+static int
+systmr_gettime(timerdev_info *tmd, u_long *t)
+{
+	struct systmr_timer_softc *scp;
+	int	ret;
+
+	scp = (struct systmr_timer_softc *)tmd->softc;
+
+	SEQ_DEBUG(printf("systmr_gettime: unit %d.\n", tmd->unit));
+
+	mtx_lock(&tmd->mtx);
+
+	if (!tmd->opened || t == NULL) {
+		ret = EINVAL;
+		goto fail;
+	}
+
+	*t = CURTICKS(scp);
+	SEQ_DEBUG(printf("systmr_gettime: ticks %lu.\n", *t));
+
+fail:
+	mtx_unlock(&tmd->mtx);
+
+	return (0);
+}
+
+static int
+systmr_ioctl(timerdev_info *tmd, u_long cmd, caddr_t data, int fflag, struct thread *td)
+{
+	struct systmr_timer_softc *scp;
+	int	ret, val;
+
+	scp = (struct systmr_timer_softc *)tmd->softc;
+	ret = 0;
+
+	SEQ_DEBUG(printf("systmr_ioctl: unit %d, cmd %s.\n",
+			 tmd->unit, midi_cmdname(cmd, cmdtab_seqioctl)));
+
+	switch (cmd) {
+	case SNDCTL_TMR_SOURCE:
+		*(int *)data = TMR_INTERNAL;
+		break;
+
+	case SNDCTL_TMR_START:
+		mtx_lock(&tmd->mtx);
+		systmr_reset(tmd);
+		scp->running = 1;
+		mtx_unlock(&tmd->mtx);
+		break;
+
+	case SNDCTL_TMR_STOP:
+		mtx_lock(&tmd->mtx);
+		scp->running = 0;
+		mtx_unlock(&tmd->mtx);
+		break;
+
+	case SNDCTL_TMR_CONTINUE:
+		mtx_lock(&tmd->mtx);
+		scp->running = 1;
+		mtx_unlock(&tmd->mtx);
+		break;
+
+	case SNDCTL_TMR_TIMEBASE:
+		val = *(int *)data;
+		mtx_lock(&tmd->mtx);
+		if (val > 0) {
+			RANGE(val, 1, 1000);
+			scp->timebase = val;
+		}
+		*(int *)data = scp->timebase;
+		mtx_unlock(&tmd->mtx);
+		SEQ_DEBUG(printf("systmr_ioctl: timebase %d.\n", *(int *)data));
+		break;
+
+	case SNDCTL_TMR_TEMPO:
+		val = *(int *)data;
+		mtx_lock(&tmd->mtx);
+		if (val > 0) {
+			RANGE(val, 8, 360);
+			scp->ticks_offset += scp->ticks_cur
+			    - scp->ticks_base;
+			scp->ticks_base = scp->ticks_cur;
+			scp->tempo = val;
+		}
+		*(int *)data = scp->tempo;
+		SEQ_DEBUG(printf("systmr_ioctl: tempo %d.\n", *(int *)data));
+		mtx_unlock(&tmd->mtx);
+		break;
+
+	case SNDCTL_SEQ_CTRLRATE:
+		val = *(int *)data;
+		if (val > 0)
+			ret = EINVAL;
+		else {
+			mtx_lock(&tmd->mtx);
+			*(int *)data = ((scp->tempo * scp->timebase) + 30) / 60;
+			mtx_unlock(&tmd->mtx);
+			SEQ_DEBUG(printf("systmr_ioctl: ctrlrate %d.\n", *(int *)data));
+		}
+		break;
+
+	case SNDCTL_TMR_METRONOME:
+		/* NOP. */
+		break;
+
+	case SNDCTL_TMR_SELECT:
+		/* NOP. */
+		break;
+
+	default:
+		ret = EINVAL;
+	}
+
+	return (ret);
+}
+
+static int
+systmr_armtimer(timerdev_info *tmd, u_long t)
+{
+	struct systmr_timer_softc *scp;
+
+	scp = (struct systmr_timer_softc *)tmd->softc;
+
+	SEQ_DEBUG(printf("systmr_armtimer: unit %d, t %lu.\n", tmd->unit, t));
+
+	mtx_lock(&tmd->mtx);
+
+	if (t < 0)
+		t = CURTICKS(scp) + 1;
+	else if (t > CURTICKS(scp))
+		scp->nexteventtime = scp->preveventtime = t;
+
+	mtx_unlock(&tmd->mtx);
+
+	return (0);
+}
diff --git a/sys/dev/sound/midi/timer.h b/sys/dev/sound/midi/timer.h
new file mode 100644
index 000000000000..a615ab64cdc9
--- /dev/null
+++ b/sys/dev/sound/midi/timer.h
@@ -0,0 +1,80 @@
+/*
+ * Include file for a midi timer.
+ * 
+ * Copyright by Seigo Tanimura 2002.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ */
+
+#ifndef _TIMER_H_
+#define _TIMER_H_
+
+typedef struct _timerdev_info timerdev_info;
+
+typedef int (tmr_open_t)(timerdev_info *tmd, int oflags, int devtype, struct thread *td);
+typedef int (tmr_close_t)(timerdev_info *tmd, int fflag, int devtype, struct thread *td);
+typedef int (tmr_event_t)(timerdev_info *tmd, u_char *ev);
+typedef int (tmr_gettime_t)(timerdev_info *tmd, u_long *t);
+typedef int (tmr_ioctl_t)(timerdev_info *tmd, u_long cmd, caddr_t data, int fflag, struct thread *td);
+typedef int (tmr_armtimer_t)(timerdev_info *tmd, u_long t);
+
+struct _timerdev_info {
+	/*
+	 * the first part of the descriptor is filled up from a
+	 * template.
+	 */
+	char		name[32];
+
+	int		caps;
+	int		prio;
+
+	tmr_open_t	*open;
+	tmr_close_t	*close;
+	tmr_event_t	*event;
+	tmr_gettime_t	*gettime;
+	tmr_ioctl_t	*ioctl;
+	tmr_armtimer_t	*armtimer;
+
+
+	int		unit;
+	void		*softc;
+	void		*seq;
+
+	/* The tailq entry of the next timer device. */
+	TAILQ_ENTRY(_timerdev_info)	tmd_link;
+
+	int		opened;
+
+	struct mtx	mtx;
+};
+
+#ifdef _KERNEL
+int		timerdev_install(void);
+timerdev_info	*create_timerdev_info_unit(timerdev_info *tmdinf);
+timerdev_info	*get_timerdev_info_unit(int unit);
+timerdev_info	*get_timerdev_info(void);
+#endif /* _KERNEL */
+
+#endif /* _TIMER_H_ */