diff --git a/FMCTCSSTX.cpp b/FMCTCSSTX.cpp
index 6eee38d..7b45c1e 100644
--- a/FMCTCSSTX.cpp
+++ b/FMCTCSSTX.cpp
@@ -102,6 +102,9 @@ uint8_t CFMCTCSSTX::setParams(uint8_t frequency, uint8_t level)
 
   m_length = entry->length;
 
+  if (m_values)
+    delete[] m_values;
+
   m_values = new q15_t[m_length];
 
   q15_t arg = 0;
diff --git a/FMKeyer.cpp b/FMKeyer.cpp
index 55eeb8b..a779d0e 100644
--- a/FMKeyer.cpp
+++ b/FMKeyer.cpp
@@ -92,6 +92,7 @@ m_lowLevel(0)
 
 uint8_t CFMKeyer::setParams(const char* text, uint8_t speed, uint16_t frequency, uint8_t highLevel, uint8_t lowLevel)
 {
+  m_poLen=0;
   for (uint8_t i = 0U; text[i] != '\0'; i++) {
     for (uint8_t j = 0U; SYMBOL_LIST[j].c != 0U; j++) {
       if (SYMBOL_LIST[j].c == text[i]) {
@@ -118,6 +119,9 @@ uint8_t CFMKeyer::setParams(const char* text, uint8_t speed, uint16_t frequency,
 
   m_audioLen = 24000U / frequency; // In samples
 
+  if (m_audio)
+    delete[] m_audio;
+
   m_audio = new bool[m_audioLen];
 
   for (uint16_t i = 0U; i < m_audioLen; i++) {