diff --git a/daemon/cmd_change_app_state.c b/daemon/cmd_change_app_state.c
index 4b269140..eaa8daa4 100644
--- a/daemon/cmd_change_app_state.c
+++ b/daemon/cmd_change_app_state.c
@@ -29,6 +29,7 @@
 #include "studio.h"
 #include "../dbus/error.h"
 #include "../proxies/notify_proxy.h"
+#include "virtualizer.h"
 
 struct ladish_command_change_app_state
 {
@@ -36,11 +37,15 @@ struct ladish_command_change_app_state
   char * opath;
   uint64_t id;
   unsigned int target_state;
+  const char * target_state_description;
+  bool (* run_target)(struct ladish_command_change_app_state *, ladish_app_supervisor_handle, ladish_app_handle);
+  void (* initiate_stop)(ladish_app_supervisor_handle supervisor, ladish_app_handle app);
 };
 
 static bool run_target_start(struct ladish_command_change_app_state * cmd_ptr, ladish_app_supervisor_handle supervisor, ladish_app_handle app)
 {
   ASSERT(cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING);
+  ASSERT(cmd_ptr->initiate_stop == NULL);
 
   if (!ladish_studio_is_started())
   {
@@ -68,49 +73,38 @@ static bool run_target_start(struct ladish_command_change_app_state * cmd_ptr, l
 
 static bool run_target_stop(struct ladish_command_change_app_state * cmd_ptr, ladish_app_supervisor_handle supervisor, ladish_app_handle app)
 {
-  if (!ladish_app_is_running(app))
+  const char * app_name;
+
+  ASSERT(cmd_ptr->initiate_stop != NULL);
+
+  app_name = ladish_app_get_name(app);
+
+  if (ladish_app_is_running(app))
   {
     if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
     {
-      log_info("App %s is already stopped (stop)", ladish_app_get_name(app));
+      cmd_ptr->initiate_stop(supervisor, app);
+      cmd_ptr->command.state = LADISH_COMMAND_STATE_WAITING;
+      return true;
     }
-    cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
+
+    ASSERT(cmd_ptr->command.state == LADISH_COMMAND_STATE_WAITING);
+    log_info("Waiting '%s' process termination (%s)...", app_name, cmd_ptr->target_state_description);
+    return true;
+  }
+
+  if (!ladish_virtualizer_is_hidden_app(ladish_studio_get_virtualizer(), app_name))
+  {
+    log_info("Waiting '%s' client disappear (%s)...", app_name, cmd_ptr->target_state_description);
     return true;
   }
 
   if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
   {
-    ladish_app_supervisor_stop_app(supervisor, app);
-    cmd_ptr->command.state = LADISH_COMMAND_STATE_WAITING;
-    return true;
+    log_info("App %s is already stopped (%s)", app_name, cmd_ptr->target_state_description);
   }
 
-  log_info("Waiting '%s' process termination (stop)...", ladish_app_get_name(app));
-
-  return true;
-}
-
-static bool run_target_kill(struct ladish_command_change_app_state * cmd_ptr, ladish_app_supervisor_handle supervisor, ladish_app_handle app)
-{
-  if (!ladish_app_is_running(app))
-  {
-    if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
-    {
-      log_info("App %s is already stopped (kill)", ladish_app_get_name(app));
-    }
-    cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
-    return true;
-  }
-
-  if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
-  {
-    ladish_app_supervisor_kill_app(supervisor, app);
-    cmd_ptr->command.state = LADISH_COMMAND_STATE_WAITING;
-    return true;
-  }
-
-  log_info("Waiting '%s' process termination(kill)...", ladish_app_get_name(app));
-
+  cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
   return true;
 }
 
@@ -120,37 +114,16 @@ static bool run(void * context)
 {
   ladish_app_supervisor_handle supervisor;
   ladish_app_handle app;
-  const char * target_state_description;
-  bool (* run_target)(struct ladish_command_change_app_state *, ladish_app_supervisor_handle, ladish_app_handle);
-
-  switch (cmd_ptr->target_state)
-  {
-  case LADISH_APP_STATE_STARTED:
-    target_state_description = "start";
-    run_target = run_target_start;
-    break;
-  case LADISH_APP_STATE_STOPPED:
-    target_state_description = "stopped";
-    run_target = run_target_stop;
-    break;
-  case LADISH_APP_STATE_KILL:
-    target_state_description = "kill";
-    run_target = run_target_kill;
-    break;
-  default:
-    ASSERT_NO_PASS;
-    return false;
-  }
 
   if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
   {
-    log_info("%s app command. opath='%s'", target_state_description, cmd_ptr->opath);
+    log_info("%s app command. opath='%s'", cmd_ptr->target_state_description, cmd_ptr->opath);
   }
 
   supervisor = ladish_studio_find_app_supervisor(cmd_ptr->opath);
   if (supervisor == NULL)
   {
-    log_error("cannot find supervisor '%s' to %s app", cmd_ptr->opath, target_state_description);
+    log_error("cannot find supervisor '%s' to %s app", cmd_ptr->opath, cmd_ptr->target_state_description);
     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot change app state because of internal error (unknown supervisor)", NULL);
     return false;
   }
@@ -158,12 +131,12 @@ static bool run(void * context)
   app = ladish_app_supervisor_find_app_by_id(supervisor, cmd_ptr->id);
   if (app == NULL)
   {
-    log_error("App with ID %"PRIu64" not found (%s)", cmd_ptr->id, target_state_description);
+    log_error("App with ID %"PRIu64" not found (%s)", cmd_ptr->id, cmd_ptr->target_state_description);
     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot change app state because it is not found", NULL);
     return false;
   }
 
-  return run_target(cmd_ptr, supervisor, app);
+  return cmd_ptr->run_target(cmd_ptr, supervisor, app);
 }
 
 static void destructor(void * context)
@@ -199,6 +172,29 @@ bool ladish_command_change_app_state(void * call_ptr, struct ladish_cqueue * que
   cmd_ptr->id = id;
   cmd_ptr->target_state = target_state;
 
+  switch (target_state)
+  {
+  case LADISH_APP_STATE_STARTED:
+    cmd_ptr->target_state_description = "start";
+    cmd_ptr->run_target = run_target_start;
+    cmd_ptr->initiate_stop = NULL;
+    break;
+  case LADISH_APP_STATE_STOPPED:
+    cmd_ptr->target_state_description = "stop";
+    cmd_ptr->run_target = run_target_stop;
+    cmd_ptr->initiate_stop = ladish_app_supervisor_stop_app;
+    break;
+  case LADISH_APP_STATE_KILL:
+    cmd_ptr->target_state_description = "kill";
+    cmd_ptr->run_target = run_target_stop;
+    cmd_ptr->initiate_stop = ladish_app_supervisor_kill_app;
+    break;
+  default:
+    ASSERT_NO_PASS;
+    lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "Invalid target state (internal error).", opath);
+    goto fail_destroy_command;
+  }
+
   if (!ladish_cqueue_add_command(queue_ptr, &cmd_ptr->command))
   {
     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_cqueue_add_command() failed.");
diff --git a/daemon/graph.c b/daemon/graph.c
index ffcc2c2c..b3570d0a 100644
--- a/daemon/graph.c
+++ b/daemon/graph.c
@@ -1910,6 +1910,20 @@ bool ladish_graph_client_looks_empty(ladish_graph_handle graph_handle, ladish_cl
   return false;
 }
 
+bool ladish_graph_client_is_hidden(ladish_graph_handle graph_handle, ladish_client_handle client_handle)
+{
+  struct ladish_graph_client * client_ptr;
+
+  client_ptr = ladish_graph_find_client(graph_ptr, client_handle);
+  if (client_ptr != NULL)
+  {
+    return client_ptr->hidden;
+  }
+
+  ASSERT_NO_PASS;
+  return true;
+}
+
 void ladish_try_connect_hidden_connections(ladish_graph_handle graph_handle)
 {
   struct list_head * node_ptr;
diff --git a/daemon/graph.h b/daemon/graph.h
index 4d6b7936..59cbd743 100644
--- a/daemon/graph.h
+++ b/daemon/graph.h
@@ -148,6 +148,7 @@ const char * ladish_graph_get_client_name(ladish_graph_handle graph_handle, ladi
 const char * ladish_graph_get_port_name(ladish_graph_handle graph, ladish_port_handle port);
 bool ladish_graph_client_is_empty(ladish_graph_handle graph_handle, ladish_client_handle client_handle);
 bool ladish_graph_client_looks_empty(ladish_graph_handle graph_handle, ladish_client_handle client_handle);
+bool ladish_graph_client_is_hidden(ladish_graph_handle graph_handle, ladish_client_handle client_handle);
 bool ladish_graph_is_port_present(ladish_graph_handle graph_handle, ladish_port_handle port_handle);
 void ladish_graph_show_port(ladish_graph_handle graph_handle, ladish_port_handle port_handle);
 void ladish_graph_hide_port(ladish_graph_handle graph_handle, ladish_port_handle port_handle);
diff --git a/daemon/studio.c b/daemon/studio.c
index 7d4ace9c..0db58775 100644
--- a/daemon/studio.c
+++ b/daemon/studio.c
@@ -649,6 +649,11 @@ struct ladish_cqueue * ladish_studio_get_cmd_queue(void)
   return &g_studio.cmd_queue;
 }
 
+ladish_virtualizer_handle ladish_studio_get_virtualizer(void)
+{
+  return g_studio.virtualizer;
+}
+
 struct ladish_studio_app_supervisor_match_context
 {
   const char * opath;
diff --git a/daemon/studio.h b/daemon/studio.h
index d7010834..b91d0c58 100644
--- a/daemon/studio.h
+++ b/daemon/studio.h
@@ -30,6 +30,7 @@
 #include "app_supervisor.h"
 #include "graph.h"
 #include "room.h"
+#include "virtualizer.h"
 
 bool ladish_studio_init(void);
 void ladish_studio_uninit(void);
@@ -53,6 +54,7 @@ ladish_studio_iterate_virtual_graphs(
 void ladish_studio_stop_app_supervisors(void);
 ladish_app_supervisor_handle ladish_studio_find_app_supervisor(const char * opath);
 struct ladish_cqueue * ladish_studio_get_cmd_queue(void);
+ladish_virtualizer_handle ladish_studio_get_virtualizer(void);
 
 void ladish_studio_emit_room_appeared(ladish_room_handle room);
 void ladish_studio_emit_room_disappeared(ladish_room_handle room);
diff --git a/daemon/virtualizer.c b/daemon/virtualizer.c
index 10b43e74..ed4381ba 100644
--- a/daemon/virtualizer.c
+++ b/daemon/virtualizer.c
@@ -1035,6 +1035,113 @@ ladish_virtualizer_get_our_clients_count(
   return virtualizer_ptr->our_clients_count;
 }
 
+bool
+ladish_virtualizer_is_hidden_app(
+  ladish_virtualizer_handle handle,
+  const char * app_name)
+{
+  ladish_client_handle jclient;
+  ladish_graph_handle vgraph;
+  uuid_t vclient_uuid;
+  ladish_client_handle vclient;
+
+  //ladish_graph_dump(g_studio.jack_graph);
+
+  jclient = ladish_graph_find_client_by_name(virtualizer_ptr->jack_graph, app_name);
+  if (jclient == NULL)
+  {
+    ASSERT_NO_PASS;
+    return true;
+  }
+
+  vgraph = ladish_client_get_vgraph(jclient);
+  if (vgraph == NULL)
+  {
+    ASSERT_NO_PASS;
+    return true;
+  }
+
+  //ladish_graph_dump(vgraph);
+
+  if (!ladish_graph_client_looks_empty(virtualizer_ptr->jack_graph, jclient) ||
+      !ladish_graph_client_is_hidden(virtualizer_ptr->jack_graph, jclient))
+  {
+    return false;
+  }
+
+  if (!ladish_client_get_interlink(jclient, vclient_uuid))
+  {
+    log_error("jack client of app '%s' has no interlinked vgraph client", app_name);
+    ASSERT_NO_PASS;
+    return true;
+  }
+
+  vclient = ladish_graph_find_client_by_uuid(vgraph, vclient_uuid);
+  if (vclient == NULL)
+  {
+    ASSERT_NO_PASS;
+    return true;
+  }
+
+  if (!ladish_graph_client_looks_empty(vgraph, vclient))
+  {
+    return false;
+  }
+
+  ASSERT(ladish_graph_client_is_hidden(vgraph, vclient)); /* vclients are automatically hidden when they start looking empty (on port disappear) */
+  return true;
+}
+
+void
+ladish_virtualizer_remove_app(
+  ladish_virtualizer_handle handle,
+  const char * app_name)
+{
+  ladish_client_handle jclient;
+  ladish_graph_handle vgraph;
+  uuid_t vclient_uuid;
+  ladish_client_handle vclient;
+
+  //ladish_graph_dump(g_studio.jack_graph);
+
+  jclient = ladish_graph_find_client_by_name(virtualizer_ptr->jack_graph, app_name);
+  if (jclient == NULL)
+  {
+    ASSERT_NO_PASS;
+    return;
+  }
+
+  vgraph = ladish_client_get_vgraph(jclient);
+  if (vgraph == NULL)
+  {
+    ASSERT_NO_PASS;
+    return;
+  }
+
+  //ladish_graph_dump(vgraph);
+
+  ladish_graph_remove_client(virtualizer_ptr->jack_graph, jclient);
+  if (!ladish_client_get_interlink(jclient, vclient_uuid))
+  {
+    log_error("jack client of app '%s' has no interlinked vgraph client", app_name);
+    ladish_graph_dump(g_studio.jack_graph);
+    ladish_graph_dump(vgraph);
+    ASSERT_NO_PASS;
+    return;
+  }
+
+  vclient = ladish_graph_find_client_by_uuid(vgraph, vclient_uuid);
+  if (vclient == NULL)
+  {
+    ASSERT_NO_PASS;
+    return;
+  }
+
+  ladish_graph_remove_client(vgraph, vclient);
+  ladish_graph_dump(g_studio.jack_graph);
+  ladish_graph_dump(vgraph);
+}
+
 void
 ladish_virtualizer_destroy(
   ladish_virtualizer_handle handle)
diff --git a/daemon/virtualizer.h b/daemon/virtualizer.h
index 3d4357b0..eb4b5d1b 100644
--- a/daemon/virtualizer.h
+++ b/daemon/virtualizer.h
@@ -48,6 +48,16 @@ unsigned int
 ladish_virtualizer_get_our_clients_count(
   ladish_virtualizer_handle handle);
 
+bool
+ladish_virtualizer_is_hidden_app(
+  ladish_virtualizer_handle handle,
+  const char * app_name);
+
+void
+ladish_virtualizer_remove_app(
+  ladish_virtualizer_handle handle,
+  const char * app_name);
+
 void
 ladish_virtualizer_destroy(
   ladish_virtualizer_handle handle);