diff --git a/src/audio/taAudio.h b/src/audio/taAudio.h
index c1ef519dd..818122bf9 100644
--- a/src/audio/taAudio.h
+++ b/src/audio/taAudio.h
@@ -25,13 +25,13 @@
 
 struct SampleRateChangeEvent {
   double rate;
-  SampleRateChangeEvent(double r):
+  explicit SampleRateChangeEvent(double r):
     rate(r) {}
 };
 
 struct BufferSizeChangeEvent {
   unsigned int bufsize;
-  BufferSizeChangeEvent(unsigned int bs):
+  explicit BufferSizeChangeEvent(unsigned int bs):
     bufsize(bs) {}
 };
 
@@ -183,6 +183,7 @@ class TAAudio {
       inBufs(NULL),
       outBufs(NULL),
       audioProcCallback(NULL),
+      audioProcCallbackUser(NULL),
       sampleRateChanged(NULL),
       bufferSizeChanged(NULL),
       midiIn(NULL),
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 3d5327565..0613d3edd 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -763,16 +763,21 @@ class DivEngine {
       totalCmds(0),
       lastCmds(0),
       cmdsPerSecond(0),
+      globalPitch(0),
       extValue(0),
       speed1(3),
       speed2(3),
       view(DIV_STATUS_NOTHING),
       haltOn(DIV_HALT_NONE),
       audioEngine(DIV_AUDIO_NULL),
+      exportMode(DIV_EXPORT_MODE_ONE),
       midiBaseChan(0),
+      samp_bb(NULL),
       samp_bbInLen(0),
       samp_temp(0),
       samp_prevSample(0),
+      samp_bbIn(NULL),
+      samp_bbOut(NULL),
       metroTick(NULL),
       metroTickLen(0),
       metroFreq(0),
@@ -793,6 +798,17 @@ class DivEngine {
       qsoundAMem(NULL),
       qsoundAMemLen(0),
       dpcmMem(NULL),
-      dpcmMemLen(0) {}
+      dpcmMemLen(0),
+      x1_010Mem(NULL),
+      x1_010MemLen(0) {
+      memset(isMuted,0,DIV_MAX_CHANS*sizeof(bool));
+      memset(keyHit,0,DIV_MAX_CHANS*sizeof(bool));
+      memset(dispatchChanOfChan,0,DIV_MAX_CHANS*sizeof(int));
+      memset(dispatchOfChan,0,DIV_MAX_CHANS*sizeof(int));
+      memset(sysOfChan,0,DIV_MAX_CHANS*sizeof(int));
+      memset(vibTable,0,64*sizeof(short));
+      memset(reversePitchTable,0,4096*sizeof(int));
+      memset(pitchTable,0,4096*sizeof(int));
+    }
 };
 #endif
diff --git a/src/engine/instrument.cpp b/src/engine/instrument.cpp
index 460fee9e2..b5ed40890 100644
--- a/src/engine/instrument.cpp
+++ b/src/engine/instrument.cpp
@@ -876,8 +876,8 @@ DivDataErrors DivInstrument::readInsData(SafeReader& reader, short version) {
     reader.readC(); // reserved
   }
 
-  // more macros
   if (version>=76) {
+    // more macros
     std.panLMacro.len=reader.readI();
     std.panRMacro.len=reader.readI();
     std.phaseResetMacro.len=reader.readI();
@@ -922,10 +922,8 @@ DivDataErrors DivInstrument::readInsData(SafeReader& reader, short version) {
     reader.read(std.ex6Macro.val,4*std.ex6Macro.len);
     reader.read(std.ex7Macro.val,4*std.ex7Macro.len);
     reader.read(std.ex8Macro.val,4*std.ex8Macro.len);
-  }
 
-  // FDS
-  if (version>=76) {
+    // FDS
     fds.modSpeed=reader.readI();
     fds.modDepth=reader.readI();
     fds.initModTableWithFirstWave=reader.readC();
diff --git a/src/engine/instrument.h b/src/engine/instrument.h
index 80df6ab49..d9e943866 100644
--- a/src/engine/instrument.h
+++ b/src/engine/instrument.h
@@ -161,7 +161,7 @@ struct DivInstrumentMacro {
   unsigned char len;
   signed char loop;
   signed char rel;
-  DivInstrumentMacro(String n, bool initOpen=false):
+  explicit DivInstrumentMacro(const String& n, bool initOpen=false):
     name(n),
     mode(0),
     open(initOpen),
diff --git a/src/engine/sample.h b/src/engine/sample.h
index 1a9e53d32..ae0c06dae 100644
--- a/src/engine/sample.h
+++ b/src/engine/sample.h
@@ -246,6 +246,7 @@ struct DivSample {
     offVOX(0),
     offSegaPCM(0),
     offQSound(0),
+    offX1_010(0),
     samples(0) {}
   ~DivSample();
 };
diff --git a/src/gui/fileDialog.h b/src/gui/fileDialog.h
index b7f21abf0..0dcd82a6d 100644
--- a/src/gui/fileDialog.h
+++ b/src/gui/fileDialog.h
@@ -23,7 +23,7 @@ class FurnaceGUIFileDialog {
     bool render(const ImVec2& min, const ImVec2& max);
     String getPath();
     String getFileName();
-    FurnaceGUIFileDialog(bool system):
+    explicit FurnaceGUIFileDialog(bool system):
       sysDialog(system),
       opened(false),
       saving(false),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 9167c9940..4711ce17b 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -644,6 +644,9 @@ struct MIDIMap {
     midiClock(false),
     midiTimeCode(false),
     valueInputStyle(1),
+    valueInputControlMSB(0),
+    valueInputControlLSB(0),
+    valueInputControlSingle(0),
     volExp(1.0f),
     valueInputCurMSB(0),
     valueInputCurLSB(0),
diff --git a/src/ta-log.h b/src/ta-log.h
index 27580e5e7..f7921c710 100644
--- a/src/ta-log.h
+++ b/src/ta-log.h
@@ -46,7 +46,9 @@ struct LogEntry {
   bool ready;
   LogEntry():
     loglevel(0),
-    ready(false) {}
+    ready(false) {
+    memset(&time,0,sizeof(struct tm));
+  }
 };
 
 int writeLog(int level, const char* msg, fmt::printf_args args);
diff --git a/src/ta-utils.h b/src/ta-utils.h
index 98b184f31..014f65f6c 100644
--- a/src/ta-utils.h
+++ b/src/ta-utils.h
@@ -50,7 +50,7 @@ struct TAParam {
   String desc;
   bool value;
   bool (*func)(String);
-  TAParam(String sn, String n, bool v, bool (*f)(String), String vn, String d):
+  TAParam(const String& sn, const String& n, bool v, bool (*f)(String), const String& vn, const String& d):
     shortName(sn),
     name(n),
     valName(vn),