diff --git a/lib_xua/api/xua_audiohub.h b/lib_xua/api/xua_audiohub.h
index 5f3e9ca2..4d018c1f 100644
--- a/lib_xua/api/xua_audiohub.h
+++ b/lib_xua/api/xua_audiohub.h
@@ -1,4 +1,4 @@
-// Copyright 2011-2022 XMOS LIMITED.
+// Copyright 2011-2023 XMOS LIMITED.
 // This Software is subject to the terms of the XMOS Public Licence: Version 1.
 #ifndef _XUA_AUDIOHUB_H_
 #define _XUA_AUDIOHUB_H_
diff --git a/lib_xua/src/core/audiohub/xua_audiohub.xc b/lib_xua/src/core/audiohub/xua_audiohub.xc
index b10bc3d9..4853822c 100755
--- a/lib_xua/src/core/audiohub/xua_audiohub.xc
+++ b/lib_xua/src/core/audiohub/xua_audiohub.xc
@@ -1,4 +1,4 @@
-// Copyright 2011-2022 XMOS LIMITED.
+// Copyright 2011-2023 XMOS LIMITED.
 // This Software is subject to the terms of the XMOS Public Licence: Version 1.
 /**
  * @file xua_audiohub.xc
@@ -89,7 +89,6 @@ unsigned dsdMode = DSD_MODE_OFF;
 #if (XUA_ADAT_TX_EN)
 #include "audiohub_adat.h"
 #endif
-
 #include "xua_audiohub_st.h"
 
 static inline int HandleSampleClock(int frameCount, buffered _XUA_CLK_DIR port:32 p_lrclk)
diff --git a/lib_xua/src/core/audiohub/xua_audiohub_st.h b/lib_xua/src/core/audiohub/xua_audiohub_st.h
index 7669c799..40dc01e8 100644
--- a/lib_xua/src/core/audiohub/xua_audiohub_st.h
+++ b/lib_xua/src/core/audiohub/xua_audiohub_st.h
@@ -1,7 +1,9 @@
-extern unsigned DoSampleTransfer(chanend ?c_out, const int readBuffNo, const unsigned underflowWord);
+// Copyright 2011-2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+
 
 #pragma unsafe arrays
-inline unsigned DoSampleTransfer(chanend ?c_out, const int readBuffNo, const unsigned underflowWord)
+static inline unsigned DoSampleTransfer(chanend ?c_out, const int readBuffNo, const unsigned underflowWord)
 {
     if(XUA_USB_EN)
     {
diff --git a/lib_xua/src/core/endpoint0/xua_endpoint0.c b/lib_xua/src/core/endpoint0/xua_endpoint0.c
index f62abcb4..9a9c0c32 100755
--- a/lib_xua/src/core/endpoint0/xua_endpoint0.c
+++ b/lib_xua/src/core/endpoint0/xua_endpoint0.c
@@ -1,4 +1,4 @@
-// Copyright 2011-2022 XMOS LIMITED.
+// Copyright 2011-2023 XMOS LIMITED.
 // This Software is subject to the terms of the XMOS Public Licence: Version 1.
 /**
  * @brief   Implements endpoint zero for an USB Audio 1.0/2.0 device
diff --git a/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc b/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
index a9758ef7..7626cc0e 100644
--- a/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
+++ b/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
@@ -1,4 +1,4 @@
-// Copyright 2011-2022 XMOS LIMITED.
+// Copyright 2011-2023 XMOS LIMITED.
 // This Software is subject to the terms of the XMOS Public Licence: Version 1.
 /**
  * @brief   Implements relevant requests from the USB Audio 2.0 Specification
diff --git a/tests/conftest.py b/tests/conftest.py
index 61945cad..3117626c 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,4 @@
-# Copyright 2022 XMOS LIMITED.
+# Copyright 2022-2023 XMOS LIMITED.
 # This Software is subject to the terms of the XMOS Public Licence: Version 1.
 import pytest
 import time
diff --git a/tests/test_mixer_routing_output/src/main.xc b/tests/test_mixer_routing_output/src/main.xc
index f5afd627..1c12700e 100644
--- a/tests/test_mixer_routing_output/src/main.xc
+++ b/tests/test_mixer_routing_output/src/main.xc
@@ -1,8 +1,4 @@
-// TODO 
-// - use lib_random
-// - use random seed from pytest
-
-// Copyright 2022 XMOS LIMITED.
+// Copyright 2022-2023 XMOS LIMITED.
 // This Software is subject to the terms of the XMOS Public Licence: Version 1.
 
 /* Tests that routing of mixer outputs behaves as expected 
diff --git a/tests/test_mixer_routing_output/src/xua_conf.h b/tests/test_mixer_routing_output/src/xua_conf.h
index 80509712..c27f54a6 100644
--- a/tests/test_mixer_routing_output/src/xua_conf.h
+++ b/tests/test_mixer_routing_output/src/xua_conf.h
@@ -1,4 +1,4 @@
-// Copyright 2016-2022 XMOS LIMITED.
+// Copyright 2016-2023 XMOS LIMITED.
 // This Software is subject to the terms of the XMOS Public Licence: Version 1.
 #ifndef _XUA_CONF_H_
 #define _XUA_CONF_H_