diff --git a/FM.cpp b/FM.cpp
index 3421d4d..ce40967 100644
--- a/FM.cpp
+++ b/FM.cpp
@@ -78,9 +78,11 @@ void CFM::samples(bool cos, const q15_t* samples, uint8_t length)
     q15_t currentRFSample = q15_t((q31_t(samples[i]) << 8) / m_rxLevel);
     uint8_t ctcssState = m_ctcssRX.process(currentRFSample);
 
-    // Delay the audio by 100ms to better match the CTCSS detector output
-    m_inputRFRB.put(currentRFSample);
-    m_inputRFRB.get(currentRFSample);
+    if (!m_useCOS) {
+      // Delay the audio by 100ms to better match the CTCSS detector output
+      m_inputRFRB.put(currentRFSample);
+      m_inputRFRB.get(currentRFSample);
+    }
 
     q15_t currentExtSample;
     bool inputExt = m_inputExtRB.get(currentExtSample);//always consume the external input data so it does not overflow
@@ -153,9 +155,8 @@ void CFM::samples(bool cos, const q15_t* samples, uint8_t length)
 void CFM::process()
 {
   q15_t sample;
-  while(io.getSpace() >= 3U && m_outputRFRB.get(sample)) {
+  while(io.getSpace() >= 3U && m_outputRFRB.get(sample))
     io.write(STATE_FM, &sample, 1U);
-  }
 }
 
 void CFM::reset()
@@ -704,4 +705,3 @@ void CFM::insertSilence(uint16_t ms)
   for (uint32_t i = 0U; i < nSamples; i++)
     m_outputRFRB.put(0);
 }
-
diff --git a/NXDNTX.cpp b/NXDNTX.cpp
index c4f5845..80ca120 100644
--- a/NXDNTX.cpp
+++ b/NXDNTX.cpp
@@ -82,7 +82,7 @@ void CNXDNTX::process()
       m_poBuffer[m_poLen++] = NXDN_PREAMBLE[2U];
     } else {
       for (uint8_t i = 0U; i < NXDN_FRAME_LENGTH_BYTES; i++) {
-        uint8_t c;
+        uint8_t c = 0U;
         m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
@@ -168,4 +168,3 @@ uint8_t CNXDNTX::getSpace() const
 {
   return m_buffer.getSpace() / NXDN_FRAME_LENGTH_BYTES;
 }
-
diff --git a/P25TX.cpp b/P25TX.cpp
index 6501f4e..fa2bfb6 100644
--- a/P25TX.cpp
+++ b/P25TX.cpp
@@ -79,7 +79,7 @@ void CP25TX::process()
       uint8_t length;
       m_buffer.get(length);
       for (uint8_t i = 0U; i < length; i++) {
-        uint8_t c;
+        uint8_t c = 0U;
         m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
diff --git a/POCSAGTX.cpp b/POCSAGTX.cpp
index 0c252d8..335bd59 100644
--- a/POCSAGTX.cpp
+++ b/POCSAGTX.cpp
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2018,2020 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -61,7 +61,7 @@ void CPOCSAGTX::process()
         m_poBuffer[m_poLen++] = POCSAG_SYNC;
     } else {
       for (uint8_t i = 0U; i < POCSAG_FRAME_LENGTH_BYTES; i++) {
-        uint8_t c;
+        uint8_t c = 0U;
         m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
@@ -147,4 +147,3 @@ uint8_t CPOCSAGTX::getSpace() const
 {
   return m_buffer.getSpace() / POCSAG_FRAME_LENGTH_BYTES;
 }
-
diff --git a/YSFTX.cpp b/YSFTX.cpp
index 5328418..15f3920 100644
--- a/YSFTX.cpp
+++ b/YSFTX.cpp
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2018 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2018,2020 by Jonathan Naylor G4KLX
  *   Copyright (C) 2017 by Andy Uribe CA6JAU
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -76,7 +76,7 @@ void CYSFTX::process()
         m_poBuffer[m_poLen++] = YSF_START_SYNC;
     } else {
       for (uint8_t i = 0U; i < YSF_FRAME_LENGTH_BYTES; i++) {
-        uint8_t c;
+        uint8_t c = 0U;
         m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
@@ -192,4 +192,3 @@ void CYSFTX::setParams(bool on, uint8_t txHang)
   m_loDev  = on;
   m_txHang = txHang * 1200U;
 }
-