--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CircuitPython/usb_midi.py	Thu Aug 29 19:05:05 2019 +0200
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2019 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module containing stubs for API generation of the 'usb_midi' module.
+"""
+
+class PortIn():
+    def read(self, nbytes=None):
+        pass
+    
+    def readinto(self, buf, nbytes=None):
+        pass
+
+class PortOut():
+    def write(self, buf):
+        pass