diff --git a/sndiod/dev.c b/sndiod/dev.c
index 61dd802..5026827 100644
--- a/sndiod/dev.c
+++ b/sndiod/dev.c
@@ -58,10 +58,10 @@ int dev_getpos(struct dev *);
 struct dev *dev_new(char *, struct aparams *, unsigned int, unsigned int,
     unsigned int, unsigned int, unsigned int, unsigned int);
 void dev_adjpar(struct dev *, int, int, int);
-int dev_open_do(struct dev *);
+int dev_allocbufs(struct dev *);
 int dev_open(struct dev *);
 void dev_exitall(struct dev *);
-void dev_close_do(struct dev *);
+void dev_freebufs(struct dev *);
 void dev_close(struct dev *);
 int dev_ref(struct dev *);
 void dev_unref(struct dev *);
@@ -83,6 +83,7 @@ void slot_attach(struct slot *);
 void slot_ready(struct slot *);
 void slot_allocbufs(struct slot *);
 void slot_freebufs(struct slot *);
+void slot_initconv(struct slot *);
 void slot_start(struct slot *);
 void slot_detach(struct slot *);
 void slot_stop(struct slot *);
@@ -1047,15 +1048,8 @@ dev_adjpar(struct dev *d, int mode,
  * monitor, midi control, and any necessary conversions.
  */
 int
-dev_open_do(struct dev *d)
+dev_allocbufs(struct dev *d)
 {
-	if (!dev_sio_open(d)) {
-		if (log_level >= 1) {
-			dev_log(d);
-			log_puts(": failed to open audio device\n");
-		}
-		return 0;
-	}
 	if (d->mode & MODE_REC) {
 		/*
 		 * Create device <-> demuxer buffer
@@ -1089,7 +1083,6 @@ dev_open_do(struct dev *d)
 		} else
 			d->encbuf = NULL;
 	}
-	d->pstate = DEV_INIT;
 	if (log_level >= 2) {
 		dev_log(d);
 		log_puts(": ");
@@ -1133,9 +1126,15 @@ dev_open(struct dev *d)
 		d->pchan = 2;
 	if (d->rchan == 0)
 		d->rchan = 2;
-	if (!dev_open_do(d))
+	if (!dev_sio_open(d)) {
+		if (log_level >= 1) {
+			dev_log(d);
+			log_puts(": failed to open audio device\n");
+		}
+		return 0;
+	}
+	if (!dev_allocbufs(d))
 		return 0;
-
 
 	/*
 	 * we use the "sndiod" group name. find a unused
@@ -1163,6 +1162,8 @@ dev_open(struct dev *d)
 	}
 	dev_addctl(d, "sndiod", gunit, CTL_NUM,
 	    CTLADDR_MASTER, "master", -1, "level", NULL, -1, d->master);
+
+	d->pstate = DEV_INIT;
 	return 1;
 }
 
@@ -1195,31 +1196,14 @@ dev_exitall(struct dev *d)
  * ensure buffers are drained
  */
 void
-dev_close_do(struct dev *d)
+dev_freebufs(struct dev *d)
 {
-	struct ctl *c, **pc;
-
 #ifdef DEBUG
 	if (log_level >= 3) {
 		dev_log(d);
 		log_puts(": closing\n");
 	}
 #endif
-	pc = &d->ctl_list;
-	while ((c = *pc) != NULL) {
-		if (c->addr >= CTLADDR_END) {
-			if (c->refs_mask == 0) {
-				*pc = c->next;
-				xfree(c);
-				continue;
-			}
-			c->type = CTL_NONE;
-			c->desc_mask = ~0;
-		}
-		pc = &c->next;
-	}
-	d->pstate = DEV_CFG;
-	dev_sio_close(d);
 	if (d->mode & MODE_PLAY) {
 		if (d->encbuf != NULL)
 			xfree(d->encbuf);
@@ -1241,7 +1225,9 @@ dev_close(struct dev *d)
 	struct ctl *c;
 
 	dev_exitall(d);
-	dev_close_do(d);
+	d->pstate = DEV_CFG;
+	dev_sio_close(d);
+	dev_freebufs(d);
 
 	/* there are no clients, just free remaining local controls */
 	while ((c = d->ctl_list) != NULL) {
@@ -1254,67 +1240,43 @@ dev_close(struct dev *d)
  * Close the device, but attempt to migrate everything to a new sndio
  * device.
  */
-void
+int
 dev_reopen(struct dev *d)
 {
 	struct slot *s;
+	struct ctl *c, **pc;
 	long long pos;
-	unsigned int mode, round, bufsz, rate, pstate;
+	unsigned int pstate;
 	int delta;
 
 	/* not opened */
 	if (d->pstate == DEV_CFG)
-		return;
-
-	if (log_level >= 1) {
-		dev_log(d);
-		log_puts(": reopening device\n");
-	}
+		return 1;
 
 	/* save state */
-	mode = d->mode;
-	round = d->round;
-	bufsz = d->bufsz;
-	rate = d->rate;
 	delta = d->delta;
 	pstate = d->pstate;
 
-	/* close device */
-	dev_close_do(d);
+	if (!dev_sio_reopen(d))
+		return 0;
 
-	/* open device */
-	if (!dev_open_do(d)) {
-		if (log_level >= 1) {
-			dev_log(d);
-			log_puts(": found no working alternate device\n");
-		}
-		dev_exitall(d);
-		return;
-	}
+	/* reopen returns a stopped device */
+	d->pstate = DEV_INIT;
 
-	/* check if new parameters are compatible with old ones */
-	if (d->mode != mode ||
-	    d->round != round ||
-	    d->bufsz != bufsz ||
-	    d->rate != rate) {
-		if (log_level >= 1) {
-			dev_log(d);
-			log_puts(": alternate device not compatible\n");
-		}
-		dev_close(d);
-		return;
-	}
+	/* reallocate new buffers, with new parameters */
+	dev_freebufs(d);
+	dev_allocbufs(d);
 
 	/*
 	 * adjust time positions, make anything go back delta ticks, so
 	 * that the new device can start at zero
 	 */
 	for (s = d->slot_list; s != NULL; s = s->next) {
-		pos = (long long)(d->round - delta) * s->round + s->delta_rem;
-		s->delta_rem = pos % d->round;
-		s->delta += pos / (int)d->round;
-		s->delta -= s->round;
-		if (log_level >= 2) {
+		pos = (long long)s->delta * d->round + s->delta_rem;
+		pos -= (long long)delta * s->round;
+		s->delta_rem = pos % (int)d->round;
+		s->delta = pos / (int)d->round;
+		if (log_level >= 3) {
 			slot_log(s);
 			log_puts(": adjusted: delta -> ");
 			log_puti(s->delta);
@@ -1322,6 +1284,9 @@ dev_reopen(struct dev *d)
 			log_puti(s->delta_rem);
 			log_puts("\n");
 		}
+
+		/* reinitilize the format conversion chain */
+		slot_initconv(s);
 	}
 	if (d->tstate == MMC_RUN) {
 		d->mtc.delta -= delta * MTC_SEC;
@@ -1333,9 +1298,29 @@ dev_reopen(struct dev *d)
 		}
 	}
 
+	/* remove controls of old device */
+	pc = &d->ctl_list;
+	while ((c = *pc) != NULL) {
+		if (c->addr >= CTLADDR_END) {
+			if (c->refs_mask == 0) {
+				*pc = c->next;
+				xfree(c);
+				continue;
+			}
+			c->type = CTL_NONE;
+			c->desc_mask = ~0;
+		}
+		pc = &c->next;
+	}
+
+	/* add new device controls */
+	dev_siomix_open(d);
+
 	/* start the device if needed */
 	if (pstate == DEV_RUN)
 		dev_wakeup(d);
+
+	return 1;
 }
 
 int
@@ -1591,31 +1576,15 @@ dev_mmcloc(struct dev *d, unsigned int origin)
 		dev_mmcstart(d);
 }
 
-
 /*
  * allocate buffers & conversion chain
  */
 void
-slot_allocbufs(struct slot *s)
+slot_initconv(struct slot *s)
 {
-	unsigned int dev_nch;
 	struct dev *d = s->dev;
 
 	if (s->mode & MODE_PLAY) {
-		s->mix.bpf = s->par.bps * s->mix.nch;
-		abuf_init(&s->mix.buf, s->appbufsz * s->mix.bpf);
-
-		dev_nch = s->opt->pmax - s->opt->pmin + 1;
-		s->mix.decbuf = NULL;
-		s->mix.resampbuf = NULL;
-		s->mix.join = 1;
-		s->mix.expand = 1;
-		if (s->opt->dup) {
-			if (dev_nch > s->mix.nch)
-				s->mix.expand = dev_nch / s->mix.nch;
-			else if (dev_nch < s->mix.nch)
-				s->mix.join = s->mix.nch / dev_nch;
-		}
 		cmap_init(&s->mix.cmap,
 		    s->opt->pmin, s->opt->pmin + s->mix.nch - 1,
 		    s->opt->pmin, s->opt->pmin + s->mix.nch - 1,
@@ -1623,32 +1592,22 @@ slot_allocbufs(struct slot *s)
 		    s->opt->pmin, s->opt->pmax);
 		if (!aparams_native(&s->par)) {
 			dec_init(&s->mix.dec, &s->par, s->mix.nch);
-			s->mix.decbuf =
-			    xmalloc(s->round * s->mix.nch * sizeof(adata_t));
 		}
 		if (s->rate != d->rate) {
 			resamp_init(&s->mix.resamp, s->round, d->round,
 			    s->mix.nch);
-			s->mix.resampbuf =
-			    xmalloc(d->round * s->mix.nch * sizeof(adata_t));
+		}
+		s->mix.join = 1;
+		s->mix.expand = 1;
+		if (s->opt->dup) {
+			if (s->mix.cmap.nch > s->mix.nch)
+				s->mix.expand = s->mix.cmap.nch / s->mix.nch;
+			else if (s->mix.cmap.nch > 0)
+				s->mix.join = s->mix.nch / s->mix.cmap.nch;
 		}
 	}
 
 	if (s->mode & MODE_RECMASK) {
-		s->sub.bpf = s->par.bps * s->sub.nch;
-		abuf_init(&s->sub.buf, s->appbufsz * s->sub.bpf);
-
-		dev_nch = s->opt->rmax - s->opt->rmin + 1;
-		s->sub.encbuf = NULL;
-		s->sub.resampbuf = NULL;
-		s->sub.join = 1;
-		s->sub.expand = 1;
-		if (s->opt->dup) {
-			if (dev_nch > s->sub.nch)
-				s->sub.join = dev_nch / s->sub.nch;
-			else if (dev_nch < s->sub.nch)
-				s->sub.expand = s->sub.nch / dev_nch;
-		}
 		cmap_init(&s->sub.cmap,
 		    0, ((s->mode & MODE_MON) ? d->pchan : d->rchan) - 1,
 		    s->opt->rmin, s->opt->rmax,
@@ -1657,13 +1616,17 @@ slot_allocbufs(struct slot *s)
 		if (s->rate != d->rate) {
 			resamp_init(&s->sub.resamp, d->round, s->round,
 			    s->sub.nch);
-			s->sub.resampbuf =
-			    xmalloc(d->round * s->sub.nch * sizeof(adata_t));
 		}
 		if (!aparams_native(&s->par)) {
 			enc_init(&s->sub.enc, &s->par, s->sub.nch);
-			s->sub.encbuf =
-			    xmalloc(s->round * s->sub.nch * sizeof(adata_t));
+		}
+		s->sub.join = 1;
+		s->sub.expand = 1;
+		if (s->opt->dup) {
+			if (s->sub.cmap.nch > s->sub.nch)
+				s->sub.join = s->sub.cmap.nch / s->sub.nch;
+			else if (s->sub.cmap.nch > 0)
+				s->sub.expand = s->sub.nch / s->sub.cmap.nch;
 		}
 
 		/*
@@ -1683,6 +1646,49 @@ slot_allocbufs(struct slot *s)
 			    s->appbufsz * s->sub.nch * sizeof(adata_t));
 		}
 	}
+}
+
+/*
+ * allocate buffers & conversion chain
+ */
+void
+slot_allocbufs(struct slot *s)
+{
+	struct dev *d = s->dev;
+
+	if (s->mode & MODE_PLAY) {
+		s->mix.bpf = s->par.bps * s->mix.nch;
+		abuf_init(&s->mix.buf, s->appbufsz * s->mix.bpf);
+
+		s->mix.decbuf = NULL;
+		s->mix.resampbuf = NULL;
+		if (!aparams_native(&s->par)) {
+			s->mix.decbuf =
+			    xmalloc(s->round * s->mix.nch * sizeof(adata_t));
+		}
+		if (s->rate != d->rate) {
+			s->mix.resampbuf =
+			    xmalloc(d->round * s->mix.nch * sizeof(adata_t));
+		}
+	}
+
+	if (s->mode & MODE_RECMASK) {
+		s->sub.bpf = s->par.bps * s->sub.nch;
+		abuf_init(&s->sub.buf, s->appbufsz * s->sub.bpf);
+
+		s->sub.encbuf = NULL;
+		s->sub.resampbuf = NULL;
+		if (s->rate != d->rate) {
+			s->sub.resampbuf =
+			    xmalloc(d->round * s->sub.nch * sizeof(adata_t));
+		}
+		if (!aparams_native(&s->par)) {
+			s->sub.encbuf =
+			    xmalloc(s->round * s->sub.nch * sizeof(adata_t));
+		}
+	}
+
+	slot_initconv(s);
 
 #ifdef DEBUG
 	if (log_level >= 3) {
diff --git a/sndiod/dev.h b/sndiod/dev.h
index 1d3e93d..7130793 100644
--- a/sndiod/dev.h
+++ b/sndiod/dev.h
@@ -254,7 +254,7 @@ extern struct dev *dev_list;
 
 void dev_log(struct dev *);
 void dev_close(struct dev *);
-void dev_reopen(struct dev *);
+int dev_reopen(struct dev *);
 struct dev *dev_new(char *, struct aparams *, unsigned int, unsigned int,
     unsigned int, unsigned int, unsigned int, unsigned int);
 struct dev *dev_bynum(int);
diff --git a/sndiod/dev_siomix.c b/sndiod/dev_siomix.c
index 8c39c92..f816499 100644
--- a/sndiod/dev_siomix.c
+++ b/sndiod/dev_siomix.c
@@ -95,14 +95,13 @@ dev_siomix_onctl(void *arg, unsigned int addr, unsigned int val)
  * open the mixer device.
  */
 void
-dev_siomix_open(struct dev *d, char *path)
+dev_siomix_open(struct dev *d)
 {
-	d->siomix.hdl = siomix_open(path, SIOMIX_READ | SIOMIX_WRITE, 0);
 	if (d->siomix.hdl == NULL)
 		return;
 	siomix_ondesc(d->siomix.hdl, dev_siomix_ondesc, d);
 	siomix_onctl(d->siomix.hdl, dev_siomix_onctl, d);
-	d->siomix.file = file_new(&dev_siomix_ops, d, path,
+	d->siomix.file = file_new(&dev_siomix_ops, d, "mix",
 	    siomix_nfds(d->siomix.hdl));
 }
 
@@ -115,8 +114,6 @@ dev_siomix_close(struct dev *d)
 	if (d->siomix.hdl == NULL)
 		return;
 	file_del(d->siomix.file);
-	siomix_close(d->siomix.hdl);
-	d->siomix.hdl = NULL;
 }
 
 int
diff --git a/sndiod/dev_siomix.h b/sndiod/dev_siomix.h
index 3ad9cdf..2c74387 100644
--- a/sndiod/dev_siomix.h
+++ b/sndiod/dev_siomix.h
@@ -26,7 +26,7 @@ struct dev_siomix {
 	struct file *file;
 };
 
-void dev_siomix_open(struct dev *, char *);
+void dev_siomix_open(struct dev *);
 void dev_siomix_close(struct dev *);
 
 #endif /* !defined(DEV_SIOMIX_H) */
diff --git a/sndiod/listen.c b/sndiod/listen.c
index 938a94f..54c9684 100644
--- a/sndiod/listen.c
+++ b/sndiod/listen.c
@@ -16,7 +16,6 @@
  */
 #include <sys/types.h>
 #include <sys/socket.h>
-#include <sys/signal.h>
 #include <sys/stat.h>
 #include <sys/un.h>
 
diff --git a/sndiod/midi.c b/sndiod/midi.c
index 00f941c..cf7aa74 100644
--- a/sndiod/midi.c
+++ b/sndiod/midi.c
@@ -596,25 +596,14 @@ port_done(struct port *c)
 		port_drain(c);
 }
 
-void
+int
 port_reopen(struct port *p)
 {
 	if (p->state == PORT_CFG)
-		return;
+		return 1;
 
-	if (log_level >= 1) {
-		port_log(p);
-		log_puts(": reopening port\n");
-	}
+	if (!port_mio_reopen(p))
+		return 0;
 
-	port_mio_close(p);
-
-	if (!port_mio_open(p)) {
-		if (log_level >= 1) {
-			port_log(p);
-			log_puts(": found no working alternate port\n");
-		}
-		p->state = PORT_CFG;
-		port_exitall(p);
-	}
+	return 1;
 }
diff --git a/sndiod/midi.h b/sndiod/midi.h
index 26f6e86..9d7c9f5 100644
--- a/sndiod/midi.h
+++ b/sndiod/midi.h
@@ -121,6 +121,6 @@ int  port_init(struct port *);
 void port_done(struct port *);
 void port_drain(struct port *);
 int  port_close(struct port *);
-void port_reopen(struct port *);
+int  port_reopen(struct port *);
 
 #endif /* !defined(MIDI_H) */
diff --git a/sndiod/miofile.c b/sndiod/miofile.c
index 7669468..1bf5e5c 100644
--- a/sndiod/miofile.c
+++ b/sndiod/miofile.c
@@ -47,18 +47,26 @@ struct fileops port_mio_ops = {
 /*
  * open the port using one of the provided paths
  */
-static char *
+static struct mio_hdl *
 port_mio_openlist(struct port *c, unsigned int mode)
 {
+	struct mio_hdl *hdl;
 	struct name *n;
 
 	n = c->path_list;
 	while (1) {
 		if (n == NULL)
 			break;
-		c->mio.hdl = mio_open(n->str, mode, 1);
-		if (c->mio.hdl != NULL)
-			return n->str;
+		hdl = mio_open(n->str, mode, 1);
+		if (hdl != NULL) {
+			if (log_level >= 2) {
+				port_log(c);
+				log_puts(": using ");
+				log_puts(n->str);
+				log_puts("\n");
+			}
+			return hdl;
+		}
 		n = n->next;
 	}
 	return NULL;
@@ -67,12 +75,37 @@ port_mio_openlist(struct port *c, unsigned int mode)
 int
 port_mio_open(struct port *p)
 {
-	char *path;
-
-	path = port_mio_openlist(p, p->midi->mode);
+	p->mio.hdl = port_mio_openlist(p, p->midi->mode);
 	if (p->mio.hdl == NULL)
 		return 0;
-	p->mio.file = file_new(&port_mio_ops, p, path, mio_nfds(p->mio.hdl));
+	p->mio.file = file_new(&port_mio_ops, p, "port", mio_nfds(p->mio.hdl));
+	return 1;
+}
+
+/*
+ * Open an alternate port. Upon success, close the old port
+ * and continue using the new one.
+ */
+int
+port_mio_reopen(struct port *p)
+{
+	struct mio_hdl *hdl;
+
+	hdl = port_mio_openlist(p, p->midi->mode);
+	if (hdl == NULL) {
+		if (log_level >= 1) {
+			port_log(p);
+			log_puts(": couldn't open an alternate port\n");
+		}
+		return 0;
+	}
+
+	/* close unused device */
+	file_del(p->mio.file);
+	mio_close(p->mio.hdl);
+
+	p->mio.hdl = hdl;
+	p->mio.file = file_new(&port_mio_ops, p, "port", mio_nfds(hdl));
 	return 1;
 }
 
@@ -150,5 +183,6 @@ port_mio_hup(void *arg)
 {
 	struct port *p = arg;
 
-	port_reopen(p);
+	if (!port_reopen(p))
+		port_close(p);
 }
diff --git a/sndiod/miofile.h b/sndiod/miofile.h
index 78ef047..3d971ca 100644
--- a/sndiod/miofile.h
+++ b/sndiod/miofile.h
@@ -25,6 +25,7 @@ struct port_mio {
 };
 
 int  port_mio_open(struct port *);
+int  port_mio_reopen(struct port *);
 void port_mio_close(struct port *);
 
 #endif /* !defined(MIOFILE_H) */
diff --git a/sndiod/siofile.c b/sndiod/siofile.c
index 376e647..73c74b1 100644
--- a/sndiod/siofile.c
+++ b/sndiod/siofile.c
@@ -87,18 +87,36 @@ dev_sio_timeout(void *arg)
 /*
  * open the device using one of the provided paths
  */
-static char *
-dev_sio_openlist(struct dev *d, unsigned int mode)
+static struct sio_hdl *
+dev_sio_openlist(struct dev *d, unsigned int mode, struct siomix_hdl **rmixhdl)
 {
 	struct name *n;
+	struct sio_hdl *hdl;
+	struct siomix_hdl *mixhdl;
 
 	n = d->path_list;
 	while (1) {
 		if (n == NULL)
 			break;
-		d->sio.hdl = sio_open(n->str, mode, 1);
-		if (d->sio.hdl != NULL)
-			return n->str;
+		hdl = sio_open(n->str, mode, 1);
+		if (hdl != NULL) {
+			if (log_level >= 2) {
+				dev_log(d);
+				log_puts(": using ");
+				log_puts(n->str);
+				log_puts("\n");
+			}
+			mixhdl = siomix_open(n->str,
+			    SIOMIX_READ | SIOMIX_WRITE, 0);
+			if (mixhdl == NULL) {
+				if (log_level >= 1) {
+					dev_log(d);
+					log_puts(": no mixer\n");
+				}
+			}
+			*rmixhdl = mixhdl;
+			return hdl;
+		}
 		n = n->next;
 	}
 	return NULL;
@@ -112,18 +130,18 @@ dev_sio_open(struct dev *d)
 {
 	struct sio_par par;
 	unsigned int mode = d->mode & (MODE_PLAY | MODE_REC);
-	char *path;
 
-	path = dev_sio_openlist(d, mode);
-	if (path == NULL) {
+	d->sio.hdl = dev_sio_openlist(d, mode, &d->siomix.hdl);
+	if (d->sio.hdl == NULL) {
 		if (mode != (SIO_PLAY | SIO_REC))
 			return 0;
-		path = dev_sio_openlist(d, SIO_PLAY);
-		if (path != NULL)
+		d->sio.hdl = dev_sio_openlist(d, SIO_PLAY, &d->siomix.hdl);
+		if (d->sio.hdl != NULL)
 			mode = SIO_PLAY;
 		else {
-			path = dev_sio_openlist(d, SIO_REC);
-			if (path != NULL)
+			d->sio.hdl = dev_sio_openlist(d,
+			    SIO_REC, &d->siomix.hdl);
+			if (d->sio.hdl != NULL)
 				mode = SIO_REC;
 			else
 				return 0;
@@ -233,18 +251,98 @@ dev_sio_open(struct dev *d)
 	if (!(mode & MODE_REC))
 		d->mode &= ~MODE_REC;
 	sio_onmove(d->sio.hdl, dev_sio_onmove, d);
-	d->sio.file = file_new(&dev_sio_ops, d, path, sio_nfds(d->sio.hdl));
+	d->sio.file = file_new(&dev_sio_ops, d, "dev", sio_nfds(d->sio.hdl));
 	timo_set(&d->sio.watchdog, dev_sio_timeout, d);
-	if (log_level >= 1) {
-		dev_log(d);
-		log_puts(": using ");
-		log_puts(path);
-		log_puts("\n");
-	}
-	dev_siomix_open(d, path);
+	dev_siomix_open(d);
 	return 1;
  bad_close:
 	sio_close(d->sio.hdl);
+	if (d->siomix.hdl) {
+		siomix_close(d->siomix.hdl);
+		d->siomix.hdl = NULL;
+	}
+	return 0;
+}
+
+/*
+ * Open an alternate device. Upon success and if the new device is
+ * compatible with the old one, close the old device and continue
+ * using the new one. The new device is not started.
+ */
+int
+dev_sio_reopen(struct dev *d)
+{
+	struct siomix_hdl *mixhdl;
+	struct sio_par par;
+	struct sio_hdl *hdl;
+
+	hdl = dev_sio_openlist(d, d->mode & (MODE_PLAY | MODE_REC), &mixhdl);
+	if (hdl == NULL) {
+		if (log_level >= 1) {
+			dev_log(d);
+			log_puts(": couldn't open an alternate device\n");
+		}
+		return 0;
+	}
+
+	sio_initpar(&par);
+	par.bits = d->par.bits;
+	par.bps = d->par.bps;
+	par.sig = d->par.sig;
+	par.le = d->par.le;
+	par.msb = d->par.msb;
+	if (d->mode & SIO_PLAY)
+		par.pchan = d->pchan;
+	if (d->mode & SIO_REC)
+		par.rchan = d->rchan;
+	par.appbufsz = d->bufsz;
+	par.round = d->round;
+	par.rate = d->rate;
+	if (!sio_setpar(hdl, &par))
+		goto bad_close;
+	if (!sio_getpar(hdl, &par))
+		goto bad_close;
+
+	/* check if new parameters are compatible with old ones */
+	if (par.round != d->round || par.bufsz != d->bufsz ||
+	    par.rate != d->rate) {
+		if (log_level >= 1) {
+			dev_log(d);
+			log_puts(": alternate device not compatible\n");
+		}
+		goto bad_close;
+	}
+
+	/* close unused device */
+	timo_del(&d->sio.watchdog);
+	file_del(d->sio.file);
+	sio_close(d->sio.hdl);
+	dev_siomix_close(d);
+	if (d->siomix.hdl) {
+		siomix_close(d->siomix.hdl);
+		d->siomix.hdl = NULL;
+	}
+
+	/* update parameters */
+	d->par.bits = par.bits;
+	d->par.bps = par.bps;
+	d->par.sig = par.sig;
+	d->par.le = par.le;
+	d->par.msb = par.msb;
+	if (d->mode & SIO_PLAY)
+		d->pchan = par.pchan;
+	if (d->mode & SIO_REC)
+		d->rchan = par.rchan;
+
+	d->sio.hdl = hdl;
+	d->siomix.hdl = mixhdl;
+	d->sio.file = file_new(&dev_sio_ops, d, "dev", sio_nfds(hdl));
+	sio_onmove(hdl, dev_sio_onmove, d);
+	return 1;
+bad_close:
+	sio_close(hdl);
+	if (mixhdl)
+		siomix_close(mixhdl);
 	return 0;
 }
 
@@ -261,6 +359,10 @@ dev_sio_close(struct dev *d)
 	timo_del(&d->sio.watchdog);
 	file_del(d->sio.file);
 	sio_close(d->sio.hdl);
+	if (d->siomix.hdl) {
+		siomix_close(d->siomix.hdl);
+		d->siomix.hdl = NULL;
+	}
 }
 
 void
@@ -523,5 +625,6 @@ dev_sio_hup(void *arg)
 		log_puts(": disconnected\n");
 	}
 #endif
-	dev_reopen(d);
+	if (!dev_reopen(d))
+		dev_close(d);
 }
diff --git a/sndiod/siofile.h b/sndiod/siofile.h
index d20066f..69c2bb4 100644
--- a/sndiod/siofile.h
+++ b/sndiod/siofile.h
@@ -38,6 +38,7 @@ struct dev_sio {
 };
 
 int dev_sio_open(struct dev *);
+int dev_sio_reopen(struct dev *);
 void dev_sio_close(struct dev *);
 void dev_sio_log(struct dev *);
 void dev_sio_start(struct dev *);
diff --git a/sndiod/sndiod.8 b/sndiod/sndiod.8
index 58b29bf..a52980b 100644
--- a/sndiod/sndiod.8
+++ b/sndiod/sndiod.8
@@ -186,7 +186,7 @@ Examples:
 .Va u8 , s16le , s24le3 , s24le4lsb .
 .It Fl F Ar device
 Specify an alternate device to use.
-If doesn't work, the one given with the last
+If it doesn't work, the one given with the last
 .Fl f
 or
 .Fl F
@@ -261,7 +261,7 @@ The default is
 (i.e. full-duplex).
 .It Fl Q Ar port
 Specify an alternate MIDI port to use.
-If doesn't work, the one given with the last
+If it doesn't work, the one given with the last
 .Fl Q
 or
 .Fl q