diff --git a/noisicaa/audioproc/__init__.py b/noisicaa/audioproc/__init__.py
index e69de29b..c0600fb2 100644
--- a/noisicaa/audioproc/__init__.py
+++ b/noisicaa/audioproc/__init__.py
@@ -0,0 +1 @@
+from .audioproc_client import AudioProcClientMixin
diff --git a/noisicaa/audioproc/audioproc_client.py b/noisicaa/audioproc/audioproc_client.py
index 46a898d3..b3e44a00 100644
--- a/noisicaa/audioproc/audioproc_client.py
+++ b/noisicaa/audioproc/audioproc_client.py
@@ -28,12 +28,15 @@ class AudioProcClientMixin(object):
         self._session_id = await self._stub.call(
             'START_SESSION', self.server.address)
 
-    async def disconnect(self):
+    async def disconnect(self, shutdown=False):
         if self._session_id is not None:
             await self._stub.call('END_SESSION', self._session_id)
             self._session_id = None
 
         if self._stub is not None:
+            if shutdown:
+                await self.shutdown()
+
             await self._stub.close()
             self._stub = None
 
diff --git a/noisicaa/editor_main.py b/noisicaa/editor_main.py
index 1134fa43..e20474b9 100644
--- a/noisicaa/editor_main.py
+++ b/noisicaa/editor_main.py
@@ -21,6 +21,9 @@ class Main(object):
         self.manager = process_manager.ProcessManager(self.event_loop)
         self.manager.server.add_command_handler(
             'CREATE_PROJECT_PROCESS', self.handle_create_project_process)
+        self.manager.server.add_command_handler(
+            'CREATE_AUDIOPROC_PROCESS',
+            self.handle_create_audioproc_process)
         self.stop_event = asyncio.Event()
         self.returncode = 0
 
@@ -118,6 +121,14 @@ class Main(object):
             'project', 'noisicaa.music.project_process.ProjectProcess')
         return proc.address
 
+    async def handle_create_audioproc_process(self, name):
+        # TODO: keep map of name->proc, only create processes for new
+        # names.
+        proc = await self.manager.start_process(
+            'audioproc<%s>' % name,
+            'noisicaa.audioproc.audioproc_process.AudioProcProcess')
+        return proc.address
+
 
 if __name__ == '__main__':
     sys.exit(Main().run(sys.argv))
diff --git a/noisicaa/music/project_client.py b/noisicaa/music/project_client.py
index 65daa788..f3231857 100644
--- a/noisicaa/music/project_client.py
+++ b/noisicaa/music/project_client.py
@@ -83,12 +83,15 @@ class ProjectClientMixin(object):
             # Connected to a loaded project.
             self.__set_project(root_id)
 
-    async def disconnect(self):
+    async def disconnect(self, shutdown=False):
         if self._session_id is not None:
             await self._stub.call('END_SESSION', self._session_id)
             self._session_id = None
 
         if self._stub is not None:
+            if shutdown:
+                await self.shutdown()
+
             await self._stub.close()
             self._stub = None
 
diff --git a/noisicaa/ui/editor_app.py b/noisicaa/ui/editor_app.py
index 55463634..47864a33 100644
--- a/noisicaa/ui/editor_app.py
+++ b/noisicaa/ui/editor_app.py
@@ -15,6 +15,7 @@ from PyQt5.QtWidgets import (
     QFileDialog,
 )
 
+from noisicaa import audioproc
 from noisicaa import music
 from noisicaa import devices
 from ..exceptions import RestartAppException, RestartAppCleanException
@@ -56,6 +57,22 @@ class ExceptHook(object):
         errorbox.exec_()
 
 
+class AudioProcClientImpl(object):
+    def __init__(self, event_loop, server):
+        super().__init__()
+        self.event_loop = event_loop
+        self.server = server
+
+    async def setup(self):
+        pass
+
+    async def cleanup(self):
+        pass
+
+class AudioProcClient(audioproc.AudioProcClientMixin, AudioProcClientImpl):
+    pass
+
+
 class BaseEditorApp(QApplication):
     def __init__(self, process, runtime_settings, settings=None):
         super().__init__(['noisicaä'])
@@ -78,6 +95,8 @@ class BaseEditorApp(QApplication):
         self.project_registry = None
         self.sequencer = None
         self.midi_hub = None
+        self.audioproc_client = None
+        self.audioproc_process = None
 
     async def setup(self):
         self.default_style = self.style().objectName()
@@ -102,8 +121,22 @@ class BaseEditorApp(QApplication):
         self.show_edit_areas_action.setChecked(
             int(self.settings.value('dev/show_edit_areas', '0')))
 
+        self.audioproc_process = await self.process.manager.call(
+            'CREATE_AUDIOPROC_PROCESS', 'main')
+
+        self.audioproc_client = AudioProcClient(
+            self.process.event_loop, self.process.server)
+        await self.audioproc_client.setup()
+        await self.audioproc_client.connect(self.audioproc_process)
+
     async def cleanup(self):
         logger.info("Cleaning up.")
+
+        if self.audioproc_client is not None:
+            await self.audioproc_client.disconnect(shutdown=True)
+            await self.audioproc_client.cleanup()
+            self.audioproc_client = None
+
         if self.midi_hub is not None:
             self.midi_hub.stop()
             self.midi_hub = None
@@ -112,6 +145,10 @@ class BaseEditorApp(QApplication):
             self.sequencer.close()
             self.sequencer = None
 
+        if self.project_registry is not None:
+            await self.project_registry.close_all()
+            self.project_registry = None
+
     def quit(self, exit_code=0):
         self.process.quit(exit_code)
 
diff --git a/noisicaa/ui/project_registry.py b/noisicaa/ui/project_registry.py
index 65ad1995..ab623ead 100644
--- a/noisicaa/ui/project_registry.py
+++ b/noisicaa/ui/project_registry.py
@@ -40,7 +40,9 @@ class Project(object):
 
     async def close(self):
         await self.client.close()
-        await self.client.shutdown()
+        await self.client.disconnect(shutdown=True)
+        await self.client.cleanup()
+        self.client = None
 
 
 class ProjectRegistry(object):
@@ -64,3 +66,7 @@ class ProjectRegistry(object):
     async def close_project(self, project):
         await project.close()
         del self.projects[project.path]
+
+    async def close_all(self):
+        for project in list(self.projects.values()):
+            await self.close_project(project)