diff --git a/src/sfizz/Logger.cpp b/src/sfizz/Logger.cpp
index 1e3bc157..7de5b20a 100644
--- a/src/sfizz/Logger.cpp
+++ b/src/sfizz/Logger.cpp
@@ -1,8 +1,10 @@
 #include "Logger.h"
+#include "Debug.h"
 #include "absl/algorithm/container.h"
 #include "ghc/fs_std.hpp"
 #include <iostream>
 #include <fstream>
+#include <sstream>
 #include <cmath>
 
 using namespace std::chrono_literals;
@@ -36,14 +38,26 @@ void printStatistics(std::vector<T>& data)
     std::cout << '\n';
 }
 
+sfz::Logger::Logger()
+{
+    keepRunning.test_and_set();
+    clearFlag.test_and_set();
+    loggingThread = std::thread(&Logger::moveEvents, this);
+}
+
 sfz::Logger::~Logger()
 {
     keepRunning.clear();
     loggingThread.join();
 
     if (!fileTimes.empty()) {
-        fs::path loadLogPath{ fs::current_path() / "file_times.csv" };
-        std::ofstream loadLogFile { loadLogPath.string() };
+        std::stringstream fileLogFilename;
+        fileLogFilename << this << "_"
+                        << prefix
+                        << "_file_log.csv";
+        fs::path fileLogPath{ fs::current_path() / fileLogFilename.str() };
+        DBG("Logging file times to " << fileLogPath.filename());
+        std::ofstream loadLogFile { fileLogPath.string() };
         loadLogFile << "WaitDuration,LoadDuration,FileSize,FileName" << '\n';
         for (auto& time: fileTimes)
             loadLogFile << time.waitDuration.count() << ','
@@ -53,7 +67,12 @@ sfz::Logger::~Logger()
     }
 
     if (!callbackTimes.empty()) {
-        fs::path callbackLogPath{ fs::current_path() / "callback_times.csv" };
+        std::stringstream callbackLogFilename;
+        callbackLogFilename << this << "_"
+                            << prefix
+                            << "_callback_log.csv";
+        fs::path callbackLogPath{ fs::current_path() / callbackLogFilename.str() };
+        DBG("Logging callback times to " << callbackLogPath.filename());
         std::ofstream callbackLogFile { callbackLogPath.string() };
         callbackLogFile << "Duration,NumVoices,NumSamples" << '\n';
         for (auto& time: callbackTimes)
@@ -74,6 +93,17 @@ void sfz::Logger::logFileTime(std::chrono::duration<double> waitDuration, std::c
     fileTimeQueue.try_push<FileTime>({ waitDuration, loadDuration, fileSize, filename });
 }
 
+void sfz::Logger::setPrefix(const std::string& prefix)
+{
+    this->prefix = prefix;
+}
+
+void sfz::Logger::clear()
+{
+    clearFlag.clear();
+    prefix.clear();
+}
+
 void sfz::Logger::moveEvents()
 {
     while(keepRunning.test_and_set()) {
@@ -85,6 +115,11 @@ void sfz::Logger::moveEvents()
         while (fileTimeQueue.try_pop(fileTime))
             fileTimes.push_back(fileTime);
 
+        if (!clearFlag.test_and_set()) {
+            fileTimes.clear();
+            callbackTimes.clear();
+        }
+
         std::this_thread::sleep_for(50ms);
     }
 }
diff --git a/src/sfizz/Logger.h b/src/sfizz/Logger.h
index b6a5c142..2bd1f6bd 100644
--- a/src/sfizz/Logger.h
+++ b/src/sfizz/Logger.h
@@ -25,6 +25,7 @@
 #include "Config.h"
 #include "atomic_queue/atomic_queue.h"
 #include <vector>
+#include <string>
 #include <chrono>
 #include <thread>
 #include "absl/strings/string_view.h"
@@ -50,20 +51,26 @@ struct CallbackTime
 class Logger
 {
 public:
-    Logger() = default;
+    Logger();
     ~Logger();
+    void setPrefix(const std::string& prefix);
+    void clear();
     void logCallbackTime(std::chrono::duration<double> duration, int numVoices, int numSamples);
     void logFileTime(std::chrono::duration<double> waitDuration, std::chrono::duration<double> loadDuration, uint32_t fileSize, absl::string_view filename);
 private:
     void moveEvents();
 
+    std::string prefix { "" };
+
     atomic_queue::AtomicQueue2<CallbackTime, config::loggerQueueSize, true, true, false, true> callbackTimeQueue;
     atomic_queue::AtomicQueue2<FileTime, config::loggerQueueSize, true, true, false, true> fileTimeQueue;
     std::vector<CallbackTime> callbackTimes;
     std::vector<FileTime> fileTimes;
 
+
     std::atomic_flag keepRunning;
-    std::thread loggingThread { &Logger::moveEvents, this };
+    std::atomic_flag clearFlag;
+    std::thread loggingThread;
 };
 
 }
diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index 7fd285d4..b146f16e 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -135,6 +135,7 @@ void sfz::Synth::clear()
         list.clear();
     regions.clear();
     resources.filePool.clear();
+    resources.logger.clear();
     numGroups = 0;
     numMasters = 0;
     numCurves = 0;
@@ -220,7 +221,7 @@ void addEndpointsToVelocityCurve(sfz::Region& region)
     }
 }
 
-bool sfz::Synth::loadSfzFile(const fs::path& filename)
+bool sfz::Synth::loadSfzFile(const fs::path& file)
 {
     AtomicDisabler callbackDisabler { canEnterCallback };
     while (inCallback) {
@@ -228,7 +229,7 @@ bool sfz::Synth::loadSfzFile(const fs::path& filename)
     }
 
     clear();
-    auto parserReturned = sfz::Parser::loadSfzFile(filename);
+    auto parserReturned = sfz::Parser::loadSfzFile(file);
     if (!parserReturned)
         return false;
 
@@ -236,6 +237,7 @@ bool sfz::Synth::loadSfzFile(const fs::path& filename)
         return false;
 
     resources.filePool.setRootDirectory(this->originalDirectory);
+    resources.logger.setPrefix(file.filename());
 
     auto currentRegion = regions.begin();
     auto lastRegion = regions.rbegin();