diff --git a/src/pipewire/remote.c b/src/pipewire/remote.c
index 25510c88b..4e8126521 100644
--- a/src/pipewire/remote.c
+++ b/src/pipewire/remote.c
@@ -39,6 +39,8 @@
 #include "extensions/protocol-native.h"
 #include "extensions/client-node.h"
 
+#define MAX_MIX	4096
+
 /** \cond */
 struct remote {
 	struct pw_remote this;
@@ -65,14 +67,11 @@ struct buffer_id {
 	struct mem_id **mem;
 };
 
-struct port {
-	struct spa_graph_port output;
-	struct spa_graph_port input;
-
+struct mix {
 	struct pw_port *port;
-
+	uint32_t mix_id;
+	struct pw_port_mix mix;
 	struct pw_array buffer_ids;
-	bool in_order;
 };
 
 struct node_data {
@@ -85,12 +84,7 @@ struct node_data {
 	struct spa_source *rtsocket_source;
         struct pw_client_node_transport *trans;
 
-	struct spa_node out_node_impl;
-	struct spa_graph_node out_node;
-	struct port *out_ports;
-	struct spa_node in_node_impl;
-	struct spa_graph_node in_node;
-	struct port *in_ports;
+	struct mix mix[MAX_MIX];
 
         struct pw_array mem_ids;
 
@@ -485,19 +479,110 @@ static void unhandle_socket(struct pw_proxy *proxy)
                        do_remove_source, 1, NULL, 0, true, data);
 }
 
+static void do_push(struct node_data *data, enum spa_direction direction)
+{
+	struct spa_graph_node *node = &data->node->rt.node;
+	struct spa_graph_port *p;
+
+	spa_list_for_each(p, &node->ports[direction], link) {
+		if (p->peer)
+			spa_node_process_input(p->peer->node->implementation);
+	}
+}
+
+static void do_pull(struct node_data *data, enum spa_direction direction)
+{
+	struct spa_graph_node *node = &data->node->rt.node;
+	struct spa_graph_port *p;
+
+	spa_list_for_each(p, &node->ports[direction], link) {
+		if (p->peer)
+			spa_node_process_output(p->peer->node->implementation);
+	}
+}
+
+static void node_need_input(void *data)
+{
+	struct node_data *d = data;
+	uint64_t cmd = 1;
+	pw_log_trace("remote %p: send need input", data);
+	do_pull(data, SPA_DIRECTION_INPUT);
+	pw_client_node_transport_add_message(d->trans,
+				&PW_CLIENT_NODE_MESSAGE_INIT(PW_CLIENT_NODE_MESSAGE_NEED_INPUT));
+	write(d->rtwritefd, &cmd, 8);
+}
+
+static void node_have_output(void *data)
+{
+	struct node_data *d = data;
+	uint64_t cmd = 1;
+
+	pw_log_trace("remote %p: have output", data);
+	do_push(data, SPA_DIRECTION_OUTPUT);
+	pw_client_node_transport_add_message(d->trans,
+                               &PW_CLIENT_NODE_MESSAGE_INIT(PW_CLIENT_NODE_MESSAGE_HAVE_OUTPUT));
+	write(d->rtwritefd, &cmd, 8);
+}
+
+static int process_input(struct node_data *data)
+{
+	struct spa_graph_node *node = &data->node->rt.node;
+	int res;
+
+	pw_log_trace("remote %p: process input", data->remote);
+	do_push(data, SPA_DIRECTION_INPUT);
+
+	if (node->implementation->process_input == NULL)
+		res = SPA_STATUS_HAVE_BUFFER;
+	else
+		res = spa_node_process_input(node->implementation);
+
+	switch (res) {
+	case SPA_STATUS_HAVE_BUFFER:
+		node_have_output(data);
+		break;
+	case SPA_STATUS_NEED_BUFFER:
+		node_need_input(data);
+		break;
+	}
+	return res;
+}
+
+static int process_output(struct node_data *data)
+{
+	struct spa_graph_node *node = &data->node->rt.node;
+	int res;
+
+	pw_log_trace("remote %p: process output", data->remote);
+	do_pull(data, SPA_DIRECTION_OUTPUT);
+
+	if (node->implementation->process_output == NULL)
+		res = SPA_STATUS_NEED_BUFFER;
+	else
+		res = spa_node_process_output(node->implementation);
+
+	switch (res) {
+	case SPA_STATUS_HAVE_BUFFER:
+		node_have_output(data);
+		break;
+	case SPA_STATUS_NEED_BUFFER:
+		node_need_input(data);
+		break;
+	}
+	return res;
+}
+
 static void handle_rtnode_message(struct pw_proxy *proxy, struct pw_client_node_message *message)
 {
 	struct node_data *data = proxy->user_data;
 
 	switch (PW_CLIENT_NODE_MESSAGE_TYPE(message)) {
 	case PW_CLIENT_NODE_MESSAGE_PROCESS_INPUT:
-		pw_log_trace("remote %p: process input", data->remote);
-		spa_graph_have_output(data->node->rt.graph, &data->in_node);
+		process_input(data);
 		break;
 
 	case PW_CLIENT_NODE_MESSAGE_PROCESS_OUTPUT:
-		pw_log_trace("remote %p: process output", data->remote);
-		spa_graph_need_input(data->node->rt.graph, &data->out_node);
+		process_output(data);
 		break;
 
 	case PW_CLIENT_NODE_MESSAGE_PORT_REUSE_BUFFER:
@@ -506,16 +591,9 @@ static void handle_rtnode_message(struct pw_proxy *proxy, struct pw_client_node_
 		    (struct pw_client_node_message_port_reuse_buffer *) message;
 		uint32_t port_id = rb->body.port_id.value;
 		uint32_t buffer_id = rb->body.buffer_id.value;
-		struct spa_graph_port *p, *pp;
+		struct spa_graph_node *node = &data->node->rt.node;
 
-		spa_list_for_each(p, &data->out_node.ports[SPA_DIRECTION_INPUT], link) {
-			if (p->port_id != port_id || (pp = p->peer) == NULL)
-				continue;
-
-			spa_node_port_reuse_buffer(pp->node->implementation,
-						   pp->port_id, buffer_id);
-			break;
-		}
+		spa_node_port_reuse_buffer(node->implementation, port_id, buffer_id);
 		break;
 	}
 	default:
@@ -618,7 +696,6 @@ static void clear_memid(struct node_data *data, struct mem_id *mid)
 static void clean_transport(struct pw_proxy *proxy)
 {
 	struct node_data *data = proxy->user_data;
-	struct pw_port *port;
 	struct mem_id *mid;
 
 	if (data->trans == NULL)
@@ -626,46 +703,67 @@ static void clean_transport(struct pw_proxy *proxy)
 
 	unhandle_socket(proxy);
 
-	spa_list_for_each(port, &data->node->input_ports, link) {
-		spa_graph_port_remove(&data->in_ports[port->port_id].output);
-		spa_graph_port_remove(&data->in_ports[port->port_id].input);
-	}
-	spa_list_for_each(port, &data->node->output_ports, link) {
-		spa_graph_port_remove(&data->out_ports[port->port_id].output);
-		spa_graph_port_remove(&data->out_ports[port->port_id].input);
-	}
-
 	pw_array_for_each(mid, &data->mem_ids)
 		clear_memid(data, mid);
 	pw_array_clear(&data->mem_ids);
 
-	free(data->in_ports);
-	free(data->out_ports);
 	pw_client_node_transport_destroy(data->trans);
 	close(data->rtwritefd);
 
 	data->trans = NULL;
 }
 
-static void port_init(struct port *port)
+static void mix_init(struct mix *mix, struct pw_port *port, uint32_t mix_id)
 {
-        pw_array_init(&port->buffer_ids, 32);
-        pw_array_ensure_size(&port->buffer_ids, sizeof(struct buffer_id) * 64);
-	port->in_order = true;
+	mix->port = port;
+	mix->mix_id = mix_id;
+	pw_port_init_mix(port, &mix->mix);
+	pw_array_init(&mix->buffer_ids, 32);
+	pw_array_ensure_size(&mix->buffer_ids, sizeof(struct buffer_id) * 64);
 }
 
-static struct port *find_port(struct node_data *data, enum spa_direction direction, uint32_t port_id)
+static int
+do_activate_mix(struct spa_loop *loop,
+                bool async, uint32_t seq, const void *data, size_t size, void *user_data)
 {
-	if (direction == SPA_DIRECTION_INPUT) {
-		if (port_id > data->trans->area->max_input_ports)
-			return NULL;
-		return &data->in_ports[port_id];
-	}
-	else {
-		if (port_id > data->trans->area->max_output_ports)
-			return NULL;
-		return &data->out_ports[port_id];
+	struct mix *mix = user_data;
+        SPA_FLAG_UNSET(mix->mix.port.flags, SPA_GRAPH_PORT_FLAG_DISABLED);
+	spa_graph_port_add(&mix->port->rt.mix_node, &mix->mix.port);
+        return 0;
+}
+
+static struct mix *find_mix(struct node_data *data,
+		enum spa_direction direction, uint32_t port_id, uint32_t mix_id)
+{
+	struct mix *mix, *empty = NULL;
+	struct pw_port *port;
+	int i;
+
+	for (i = 0; i < MAX_MIX; i++) {
+		mix = &data->mix[i];
+
+		if (mix->port == NULL) {
+			empty = mix;
+			continue;
+		}
+		if (mix->port->direction == (enum pw_direction) direction &&
+		    mix->port->port_id == port_id &&
+		    mix->mix_id == mix_id)
+			return mix;
 	}
+	if (empty == NULL)
+		return NULL;
+
+	port = pw_node_find_port(data->node, direction, port_id);
+	if (port == NULL)
+		return NULL;
+
+	mix_init(empty, port, mix_id);
+
+	pw_loop_invoke(data->core->data_loop,
+                       do_activate_mix, SPA_ID_INVALID, NULL, 0, false, empty);
+
+	return empty;
 }
 
 static void client_node_add_mem(void *object,
@@ -700,8 +798,6 @@ static void client_node_transport(void *object, uint32_t node_id,
 {
 	struct pw_proxy *proxy = object;
 	struct node_data *data = proxy->user_data;
-	struct pw_port *port;
-	int i;
 
 	clean_transport(proxy);
 
@@ -711,47 +807,6 @@ static void client_node_transport(void *object, uint32_t node_id,
 	pw_log_info("remote-node %p: create transport %p with fds %d %d for node %u",
 		proxy, data->trans, readfd, writefd, node_id);
 
-	data->in_ports = calloc(data->trans->area->max_input_ports,
-				 sizeof(struct port));
-	data->out_ports = calloc(data->trans->area->max_output_ports,
-				  sizeof(struct port));
-
-	for (i = 0; i < data->trans->area->max_input_ports; i++) {
-		port_init(&data->in_ports[i]);
-		spa_graph_port_init(&data->in_ports[i].input,
-				    SPA_DIRECTION_INPUT, i,
-				    0,
-				    NULL);
-		spa_graph_port_init(&data->in_ports[i].output,
-				    SPA_DIRECTION_OUTPUT, i,
-				    0,
-				    NULL);
-		spa_graph_port_add(&data->in_node, &data->in_ports[i].output);
-		spa_graph_port_link(&data->in_ports[i].output, &data->in_ports[i].input);
-	}
-	spa_list_for_each(port, &data->node->input_ports, link) {
-		spa_graph_port_add(&port->rt.mix_node, &data->in_ports[port->port_id].input);
-		data->in_ports[port->port_id].port = port;
-	}
-
-	for (i = 0; i < data->trans->area->max_output_ports; i++) {
-		port_init(&data->out_ports[i]);
-		spa_graph_port_init(&data->out_ports[i].output,
-				    SPA_DIRECTION_OUTPUT, i,
-				    0,
-				    NULL);
-		spa_graph_port_init(&data->out_ports[i].input,
-				    SPA_DIRECTION_INPUT, i,
-				    0,
-				    NULL);
-		spa_graph_port_add(&data->out_node, &data->out_ports[i].input);
-		spa_graph_port_link(&data->out_ports[i].output, &data->out_ports[i].input);
-	}
-	spa_list_for_each(port, &data->node->output_ports, link) {
-		spa_graph_port_add(&port->rt.mix_node, &data->out_ports[port->port_id].output);
-		data->out_ports[port->port_id].port = port;
-	}
-
         data->rtwritefd = writefd;
         data->rtsocket_source = pw_loop_add_io(proxy->remote->core->data_loop,
                                                readfd,
@@ -833,24 +888,6 @@ static void client_node_event(void *object, const struct spa_event *event)
 }
 
 
-static void node_need_input(void *data)
-{
-	struct node_data *d = data;
-        uint64_t cmd = 1;
-	pw_client_node_transport_add_message(d->trans,
-				&PW_CLIENT_NODE_MESSAGE_INIT(PW_CLIENT_NODE_MESSAGE_NEED_INPUT));
-        write(d->rtwritefd, &cmd, 8);
-}
-
-static void node_have_output(void *data)
-{
-	struct node_data *d = data;
-        uint64_t cmd = 1;
-        pw_client_node_transport_add_message(d->trans,
-                               &PW_CLIENT_NODE_MESSAGE_INIT(PW_CLIENT_NODE_MESSAGE_HAVE_OUTPUT));
-        write(d->rtwritefd, &cmd, 8);
-}
-
 static void client_node_command(void *object, uint32_t seq, const struct spa_command *command)
 {
 	struct pw_proxy *proxy = object;
@@ -871,8 +908,6 @@ static void client_node_command(void *object, uint32_t seq, const struct spa_com
 		pw_client_node_proxy_done(data->node_proxy, seq, res);
 	}
 	else if (SPA_COMMAND_TYPE(command) == remote->core->type.command_node.Start) {
-		int i;
-
 		pw_log_debug("node %p: start %d", proxy, seq);
 
 		pw_loop_update_io(remote->core->data_loop,
@@ -882,12 +917,7 @@ static void client_node_command(void *object, uint32_t seq, const struct spa_com
 		if ((res = spa_node_send_command(data->node->node, command)) < 0)
 			pw_log_warn("node %p: start failed", proxy);
 
-		/* FIXME we should call process_output on the node and see what its
-		 * status is */
-		for (i = 0; i < data->trans->area->max_input_ports; i++)
-			data->in_ports[i].input.io->status = SPA_STATUS_NEED_BUFFER;
-		node_need_input(data);
-
+		process_output(data);
 		pw_client_node_proxy_done(data->node_proxy, seq, res);
 	}
 	else if (SPA_COMMAND_TYPE(command) == remote->core->type.command_node.ClockUpdate) {
@@ -932,20 +962,20 @@ client_node_port_set_param(void *object,
 {
 	struct pw_proxy *proxy = object;
 	struct node_data *data = proxy->user_data;
-	struct port *port;
+	struct pw_port *port;
 	int res;
 
-	port = find_port(data, direction, port_id);
-	if (port == NULL || port->port == NULL) {
+	port = pw_node_find_port(data->node, direction, port_id);
+	if (port == NULL) {
 		res = -EINVAL;
 		goto done;
 	}
 
-	res = pw_port_set_param(port->port, id, flags, param);
+	res = pw_port_set_param(port, id, flags, param);
 	if (res < 0)
 		goto done;
 
-	add_port_update(proxy, port->port,
+	add_port_update(proxy, port,
 			PW_CLIENT_NODE_PORT_UPDATE_PARAMS |
 			PW_CLIENT_NODE_PORT_UPDATE_INFO);
 
@@ -953,15 +983,16 @@ client_node_port_set_param(void *object,
 	pw_client_node_proxy_done(data->node_proxy, seq, res);
 }
 
-static void clear_buffers(struct node_data *data, struct port *port)
+static void clear_buffers(struct node_data *data, struct mix *mix)
 {
+	struct pw_port *port = mix->port;
         struct buffer_id *bid;
 	int i;
 
         pw_log_debug("port %p: clear buffers", port);
-	pw_port_use_buffers(port->port, NULL, 0);
+	pw_port_use_buffers(port, NULL, 0);
 
-        pw_array_for_each(bid, &port->buffer_ids) {
+        pw_array_for_each(bid, &mix->buffer_ids) {
 		if (bid->ptr != NULL) {
 			if (munmap(bid->ptr, bid->map.size) < 0)
 				pw_log_warn("failed to unmap: %m");
@@ -978,7 +1009,7 @@ static void clear_buffers(struct node_data *data, struct port *port)
                 free(bid->buf);
                 bid->buf = NULL;
         }
-        port->buffer_ids.size = 0;
+	mix->buffer_ids.size = 0;
 }
 
 static void
@@ -992,13 +1023,13 @@ client_node_port_use_buffers(void *object,
 	struct buffer_id *bid;
 	uint32_t i, j, len;
 	struct spa_buffer *b, **bufs;
-	struct port *port;
+	struct mix *mix;
 	struct pw_core *core = proxy->remote->core;
 	struct pw_type *t = &core->type;
 	int res, prot;
 
-	port = find_port(data, direction, port_id);
-	if (port == NULL) {
+	mix = find_mix(data, direction, port_id, mix_id);
+	if (mix == NULL) {
 		res = -EINVAL;
 		goto done;
 	}
@@ -1006,7 +1037,7 @@ client_node_port_use_buffers(void *object,
 	prot = PROT_READ | (direction == SPA_DIRECTION_OUTPUT ? PROT_WRITE : 0);
 
 	/* clear previous buffers */
-	clear_buffers(data, port);
+	clear_buffers(data, mix);
 
 	bufs = alloca(n_buffers * sizeof(struct spa_buffer *));
 
@@ -1020,8 +1051,8 @@ client_node_port_use_buffers(void *object,
 			goto cleanup;
 		}
 
-		len = pw_array_get_len(&port->buffer_ids, struct buffer_id);
-		bid = pw_array_add(&port->buffer_ids, sizeof(struct buffer_id));
+		len = pw_array_get_len(&mix->buffer_ids, struct buffer_id);
+		bid = pw_array_add(&mix->buffer_ids, sizeof(struct buffer_id));
 
 		pw_map_range_init(&bid->map, buffers[i].offset, buffers[i].size, core->sc_pagesize);
 
@@ -1114,14 +1145,14 @@ client_node_port_use_buffers(void *object,
 		bufs[i] = b;
 	}
 
-	res = pw_port_use_buffers(port->port, bufs, n_buffers);
+	res = pw_port_use_buffers(mix->port, bufs, n_buffers);
 
       done:
 	pw_client_node_proxy_done(data->node_proxy, seq, res);
 	return;
 
      cleanup:
-	clear_buffers(data, port);
+	clear_buffers(data, mix);
 	goto done;
 
 }
@@ -1134,13 +1165,13 @@ client_node_port_command(void *object,
 {
 	struct pw_proxy *proxy = object;
 	struct node_data *data = proxy->user_data;
-	struct port *port;
+	struct pw_port *port;
 
-	port = find_port(data, direction, port_id);
+	port = pw_node_find_port(data->node, direction, port_id);
 	if (port == NULL)
 		return;
 
-	pw_port_send_command(port->port, true, command);
+	pw_port_send_command(port, true, command);
 }
 
 static void
@@ -1158,12 +1189,12 @@ client_node_port_set_io(void *object,
 	struct node_data *data = proxy->user_data;
 	struct pw_core *core = proxy->remote->core;
 	struct pw_type *t = &core->type;
-	struct port *port;
+	struct mix *mix;
 	struct mem_id *mid;
 	void *ptr;
 
-	port = find_port(data, direction, port_id);
-	if (port == NULL)
+	mix = find_mix(data, direction, port_id, mix_id);
+	if (mix == NULL)
 		return;
 
 	if (memid == SPA_ID_INVALID) {
@@ -1182,13 +1213,20 @@ client_node_port_set_io(void *object,
 	}
 
 
-	pw_log_debug("port %p: set io %s %p", port, spa_type_map_get_type(core->type.map, id), ptr);
+	pw_log_debug("port %p: set io %s %p", mix->port,
+			spa_type_map_get_type(core->type.map, id), ptr);
 
 	if (id == t->io.Buffers) {
-		port->input.io = ptr;
-		port->output.io = ptr;
+		mix->mix.port.io = ptr;
+		if (ptr) {
+			mix->mix.port.io->buffer_id = SPA_ID_INVALID;
+			if (direction == SPA_DIRECTION_INPUT)
+				mix->mix.port.io->status = SPA_STATUS_NEED_BUFFER;
+			else
+				mix->mix.port.io->status = SPA_STATUS_OK;
+		}
 	} else {
-		spa_node_port_set_io(port->port->node->node,
+		spa_node_port_set_io(mix->port->node->node,
 				     direction, port_id,
 				     id,
 				     ptr,
@@ -1254,6 +1292,7 @@ static void node_active_changed(void *data, bool active)
 	pw_client_node_proxy_set_active(d->node_proxy, active);
 }
 
+
 static const struct pw_node_events node_events = {
 	PW_VERSION_NODE_EVENTS,
 	.destroy = node_destroy,
@@ -1262,10 +1301,13 @@ static const struct pw_node_events node_events = {
 	.have_output = node_have_output,
 };
 
-static void clear_port(struct node_data *data, struct port *port)
+static void clear_mix(struct node_data *data, struct mix *mix)
 {
-	clear_buffers(data, port);
-	pw_array_clear(&port->buffer_ids);
+	if (mix->port) {
+		clear_buffers(data, mix);
+		pw_array_clear(&mix->buffer_ids);
+		mix->port = NULL;
+	}
 }
 
 static void node_proxy_destroy(void *_data)
@@ -1275,10 +1317,8 @@ static void node_proxy_destroy(void *_data)
 	int i;
 
 	if (data->trans) {
-		for (i = 0; i < data->trans->area->max_input_ports; i++)
-			clear_port(data, &data->in_ports[i]);
-		for (i = 0; i < data->trans->area->max_output_ports; i++)
-			clear_port(data, &data->out_ports[i]);
+		for (i = 0; i < MAX_MIX; i++)
+			clear_mix(data, &data->mix[i]);
 	}
 	clean_transport(proxy);
 
@@ -1290,36 +1330,6 @@ static const struct pw_proxy_events proxy_events = {
 	.destroy = node_proxy_destroy,
 };
 
-static int impl_port_reuse_buffer(struct spa_node *node, uint32_t port_id, uint32_t buffer_id)
-{
-	pw_log_trace("node %p: reuse buffer %d %d", node, port_id, buffer_id);
-	return 0;
-}
-
-static int impl_process_input(struct spa_node *node)
-{
-	struct node_data *data = SPA_CONTAINER_OF(node, struct node_data, out_node_impl);
-	pw_log_trace("node %p: process input", node);
-	node_have_output(data);
-	return 0;
-}
-
-static int impl_process_output(struct spa_node *node)
-{
-	struct node_data *data = SPA_CONTAINER_OF(node, struct node_data, in_node_impl);
-	pw_log_trace("node %p: process output", node);
-	node_need_input(data);
-	return 0;
-}
-
-static const struct spa_node node_impl = {
-	SPA_VERSION_NODE,
-	NULL,
-	.process_input = impl_process_input,
-	.process_output = impl_process_output,
-	.port_reuse_buffer = impl_port_reuse_buffer,
-};
-
 struct pw_proxy *pw_remote_export(struct pw_remote *remote,
 				  struct pw_node *node)
 {
@@ -1342,17 +1352,10 @@ struct pw_proxy *pw_remote_export(struct pw_remote *remote,
 	data->core = pw_node_get_core(node);
 	data->t = pw_core_get_type(data->core);
 	data->node_proxy = (struct pw_client_node_proxy *)proxy;
-	data->in_node_impl = node_impl;
-	data->out_node_impl = node_impl;
 
         pw_array_init(&data->mem_ids, 64);
         pw_array_ensure_size(&data->mem_ids, sizeof(struct mem_id) * 64);
 
-	spa_graph_node_init(&data->in_node);
-	spa_graph_node_set_implementation(&data->in_node, &data->in_node_impl);
-	spa_graph_node_init(&data->out_node);
-	spa_graph_node_set_implementation(&data->out_node, &data->out_node_impl);
-
 	pw_proxy_add_listener(proxy, &data->proxy_listener, &proxy_events, data);
 	pw_node_add_listener(node, &data->node_listener, &node_events, data);