diff --git a/src/AudioTools/Concurrency/LockGuard.h b/src/AudioTools/Concurrency/LockGuard.h
index 2a8526e97..c52ab82e7 100644
--- a/src/AudioTools/Concurrency/LockGuard.h
+++ b/src/AudioTools/Concurrency/LockGuard.h
@@ -1,6 +1,5 @@
 #pragma once
 #include "AudioConfig.h"
-#include "AudioTools/CoreAudio/AudioLogger.h"
 #include "Mutex.h"
 
 namespace audio_tools {
@@ -18,18 +17,15 @@ namespace audio_tools {
 class LockGuard {
 public:
   LockGuard(MutexBase &mutex) {
-    TRACED();
     p_mutex = &mutex;
     p_mutex->lock();
   }
   LockGuard(MutexBase *mutex) {
-    TRACED();
     p_mutex = mutex;
     if (p_mutex != nullptr)
       p_mutex->lock();
   }
   ~LockGuard() {
-    TRACED();
     if (p_mutex != nullptr)
       p_mutex->unlock();
   }
diff --git a/src/AudioTools/Concurrency/RP2040/BufferRP2040.h b/src/AudioTools/Concurrency/RP2040/BufferRP2040.h
index 48bb23ef1..a7cc868e9 100644
--- a/src/AudioTools/Concurrency/RP2040/BufferRP2040.h
+++ b/src/AudioTools/Concurrency/RP2040/BufferRP2040.h
@@ -15,7 +15,7 @@ namespace audio_tools {
 /**
  * @brief Buffer implementation which is based on a RP2040 queue. This
  * class is intended to be used to exchange data between the 2 different
- * cores.
+ * cores. Multi-core and IRQ safe queue implementation!
  * @ingroup buffers
  * @ingroup concurrency
  * @author Phil Schatzmann
@@ -38,8 +38,10 @@ class BufferRP2040T : public BaseBuffer<T> {
     if (buffer_size_total_bytes != buffer_size_req_bytes) {
       LOGI("resize %d -> %d", buffer_size_total_bytes, buffer_size_req_bytes);
       assert(buffer_size > 0);
-      write_buffer.resize(buffer_size);
-      read_buffer.resize(buffer_size * 2);
+      if (is_blocking_write){
+        write_buffer.resize(buffer_size);
+        read_buffer.resize(buffer_size * 2);
+      }
       // release existing queue
       if (buffer_size_total_bytes > 0) {
         queue_free(&queue);
@@ -71,6 +73,10 @@ class BufferRP2040T : public BaseBuffer<T> {
   // reads multiple values
   int readArray(T data[], int len) override {
     LOGD("readArray: %d", len);
+    if (!is_blocking_write && read_buffer.size()==0){
+      // make sure that the read buffer is big enough
+      read_buffer.resize(len + buffer_size);
+    }
     // handle unalloc;ated queue
     if (buffer_size_total_bytes == 0) return 0;
     if (isEmpty() && read_buffer.isEmpty()) return 0;
@@ -94,24 +100,17 @@ class BufferRP2040T : public BaseBuffer<T> {
 
   int writeArray(const T data[], int len) override {
     LOGD("writeArray: %d", len);
+    int result = 0;
     // make sure that we have the data allocated
     resize(buffer_size_req_bytes);
 
-    // blocking write: wait for available space
-    while (availableForWrite()<=len){
-      delay(5);
-    };
-
-    // fill the write buffer and when it is full flush it to the queue
-    for (int j = 0; j < len; j++) {
-      write_buffer.write(data[j]);
-      if (write_buffer.isFull()) {
-        LOGD("queue_add_blocking");
-        queue_add_blocking(&queue, write_buffer.data());
-        write_buffer.reset();
-      }
+    if (is_blocking_write) {
+      result = writeBlocking(data, len);
+    } else {
+      result = writeNonBlocking(data, len);
     }
-    return len;
+
+    return result;
   }
 
   // checks if the buffer is full
@@ -150,6 +149,11 @@ class BufferRP2040T : public BaseBuffer<T> {
 
   size_t size() { return buffer_size_req_bytes / sizeof(T); }
 
+  /// When we use a non blocking write, the write size must be identical with the buffer size
+  void setBlockingWrite(bool flag){
+    is_blocking_write = flag;
+  }
+
  protected:
   queue_t queue;
   int buffer_size_total_bytes = 0;
@@ -157,6 +161,40 @@ class BufferRP2040T : public BaseBuffer<T> {
   int buffer_size = 0;
   SingleBuffer<T> write_buffer{0};
   audio_tools::RingBuffer<T> read_buffer{0};
+  bool is_blocking_write = true;
+
+  int writeBlocking(const T data[], int len) {
+    LOGD("writeArray: %d", len);
+
+    if (len > buffer_size){
+      LOGE("write %d too big for buffer_size: %d", len, buffer_size);
+      return 0;
+    }
+
+    // fill the write buffer and when it is full flush it to the queue
+    for (int j = 0; j < len; j++) {
+      write_buffer.write(data[j]);
+      if (write_buffer.isFull()) {
+        LOGD("queue_add_blocking");
+        queue_add_blocking(&queue, write_buffer.data());
+        write_buffer.reset();
+      }
+    }
+    return len;
+  }
+
+  int writeNonBlocking(const T data[], int len) {
+    if (len != buffer_size){
+      LOGE("write %d must be buffer_size: %d", len, buffer_size);
+      return 0;
+    }
+
+    if (queue_try_add(&queue, write_buffer.data())){
+      return len;
+    }
+    return 0;
+  }
+
 };
 
 using BufferRP2040 = BufferRP2040T<uint8_t>;
diff --git a/src/AudioTools/CoreAudio/AudioLogger.h b/src/AudioTools/CoreAudio/AudioLogger.h
index e66bd99ac..9343b8d92 100644
--- a/src/AudioTools/CoreAudio/AudioLogger.h
+++ b/src/AudioTools/CoreAudio/AudioLogger.h
@@ -4,18 +4,28 @@
 #if defined(ARDUINO) && !defined(IS_MIN_DESKTOP)
 #  include "Print.h"
 #endif
+
+#if defined(RP2040)
+#  include "AudioTools/Concurrency/RP2040.h"
+#elif defined(ESP32)
+#  include "AudioTools/Concurrency/RTOS.h"
+#else
+#  include "AudioTools/Concurrency/LockGuard.h"
+#endif
+
 // Logging Implementation
 #if USE_AUDIO_LOGGING
 
 namespace audio_tools {
 
-#if defined(ESP32) && defined(SYNCHRONIZED_LOGGING)
-#  include "freertos/FreeRTOS.h"
-#  include "freertos/task.h"
-static portMUX_TYPE mutex_logger = portMUX_INITIALIZER_UNLOCKED;
+#if defined(RP2040)
+MutexRP2040 audio_logger_mutex;
+#elif defined(ESP32)
+MutexESP32 audio_logger_mutex;
+#else
+MutexBase audio_logger_mutex; // no locking
 #endif
 
-
 /**
  * @brief A simple Logger that writes messages dependent on the log level
  * @ingroup tools
@@ -53,7 +63,6 @@ class AudioLogger {
         }
 
         AudioLogger &prefix(const char* file, int line, LogLevel current_level){
-            lock();
             printPrefix(file,line,current_level);
             return *this;
         }
@@ -65,7 +74,6 @@ class AudioLogger {
             log_print_ptr->println(print_buffer);
 #endif
             print_buffer[0]=0;
-            unlock();
         }
 
         char* str() {
@@ -134,17 +142,6 @@ class AudioLogger {
             return len;
         }
 
-        void lock(){
-            #if defined(ESP32) && defined(SYNCHRONIZED_LOGGING)
-                portENTER_CRITICAL(&mutex_logger);
-            #endif
-        }
-
-        void unlock(){
-            #if defined(ESP32) && defined(SYNCHRONIZED_LOGGING)
-                portEXIT_CRITICAL(&mutex_logger);
-            #endif
-        }
 };
 
 static AudioLogger &AudioToolsLogger = AudioLogger::instance();
@@ -188,17 +185,20 @@ class CustomLogLevel {
 
 //#define LOG_OUT(level, fmt, ...) {AudioLogger::instance().prefix(__FILE__,__LINE__, level);cont char PROGMEM *fmt_P=F(fmt); snprintf_P(AudioLogger::instance().str(), LOG_PRINTF_BUFFER_SIZE, fmt,  ##__VA_ARGS__); AudioLogger::instance().println();}
 #define LOG_OUT_PGMEM(level, fmt, ...) { \
+    LockGuard guard{audio_logger_mutex};\
     AudioLogger::instance().prefix(__FILE__,__LINE__, level); \
     snprintf(AudioLogger::instance().str(), LOG_PRINTF_BUFFER_SIZE, PSTR(fmt),  ##__VA_ARGS__); \
     AudioLogger::instance().println();\
 }
 
 #define LOG_OUT(level, fmt, ...) { \
+    LockGuard guard{audio_logger_mutex};\
     AudioLogger::instance().prefix(__FILE__,__LINE__, level); \
     snprintf(AudioLogger::instance().str(), LOG_PRINTF_BUFFER_SIZE, fmt,  ##__VA_ARGS__); \
     AudioLogger::instance().println();\
 }
 #define LOG_MIN(level) { \
+    LockGuard guard{audio_logger_mutex};\
     AudioLogger::instance().prefix(__FILE__,__LINE__, level); \
     AudioLogger::instance().println();\
 }