diff --git a/src/engine/dispatch.h b/src/engine/dispatch.h
index 835bf055b..82ae4f710 100644
--- a/src/engine/dispatch.h
+++ b/src/engine/dispatch.h
@@ -103,6 +103,7 @@ class DivDispatch {
     int rate;
     virtual void acquire(short* bufL, short* bufR, size_t start, size_t len);
     virtual int dispatch(DivCommand c);
+    virtual void reset();
     virtual void tick();
 
     virtual bool isStereo();
diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 0c0ad1cfc..7704221a5 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -991,7 +991,43 @@ void DivEngine::setLoops(int loops) {
 }
 
 void DivEngine::play() {
-  
+  isBusy.lock();
+  for (int i=0; i<17; i++) {
+    chan[i]=DivChannelState();
+  }
+  dispatch->reset();
+  playing=true;
+  curRow=0;
+  clockDrift=0;
+  cycles=0;
+  isBusy.unlock();
+}
+
+void DivEngine::stop() {
+  isBusy.lock();
+  playing=false;
+  isBusy.unlock();
+}
+
+unsigned char DivEngine::getOrder() {
+  return curOrder;
+}
+
+void DivEngine::setOrder(unsigned char order) {
+  isBusy.lock();
+  curOrder=order;
+  if (order>=song.ordersLen) curOrder=0;
+  if (playing) {
+    for (int i=0; i<17; i++) {
+      chan[i]=DivChannelState();
+    }
+    dispatch->reset();
+    playing=true;
+    curRow=0;
+    clockDrift=0;
+    cycles=0;
+  }
+  isBusy.unlock();
 }
 
 void DivEngine::setAudio(DivAudioEngines which) {
diff --git a/src/engine/engine.h b/src/engine/engine.h
index a1412283c..050f0449f 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -4,6 +4,7 @@
 #include "dispatch.h"
 #include "../audio/taAudio.h"
 #include "blip_buf.h"
+#include <mutex>
 
 enum DivStatusView {
   DIV_STATUS_NOTHING=0,
@@ -71,6 +72,7 @@ class DivEngine {
   DivStatusView view;
   DivChannelState chan[17];
   DivAudioEngines audioEngine;
+  std::mutex isBusy;
 
   short vibTable[64];
 
@@ -107,6 +109,15 @@ class DivEngine {
     // play
     void play();
 
+    // stop
+    void stop();
+
+    // get current order
+    unsigned char getOrder();
+
+    // go to order
+    void setOrder(unsigned char order);
+
     // set remaining loops. -1 means loop forever.
     void setLoops(int loops);
 
diff --git a/src/engine/platform/abstract.cpp b/src/engine/platform/abstract.cpp
index ceef77b38..65582a9b5 100644
--- a/src/engine/platform/abstract.cpp
+++ b/src/engine/platform/abstract.cpp
@@ -10,6 +10,9 @@ int DivDispatch::dispatch(DivCommand c) {
   return 1;
 }
 
+void DivDispatch::reset() {
+}
+
 bool DivDispatch::isStereo() {
   return false;
 }
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index 36dfc5b5a..9e2606b00 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -471,25 +471,11 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
   return 1;
 }
 
-bool DivPlatformYM2610::isStereo() {
-  return true;
-}
-
-bool DivPlatformYM2610::keyOffAffectsArp(int ch) {
-  return (ch>3);
-}
-
-int DivPlatformYM2610::init(DivEngine* p, int channels, int sugRate, bool pal) {
-  parent=p;
-  if (pal) {
-    rate=500000;
-  } else {
-    rate=500000;
-  }
-  iface.parent=parent;
-  iface.sampleBank=0;
-  fm=new ymfm::ym2610(iface);
+void DivPlatformYM2610::reset() {
   fm->reset();
+  for (int i=0; i<13; i++) {
+    chan[i]=DivPlatformYM2610::Channel();
+  }
   for (int i=0; i<4; i++) {
     chan[i].vol=0x7f;
   }
@@ -523,5 +509,26 @@ int DivPlatformYM2610::init(DivEngine* p, int channels, int sugRate, bool pal) {
 
   // PCM volume
   writes.emplace(0x101,0x3f);
+}
+
+bool DivPlatformYM2610::isStereo() {
+  return true;
+}
+
+bool DivPlatformYM2610::keyOffAffectsArp(int ch) {
+  return (ch>3);
+}
+
+int DivPlatformYM2610::init(DivEngine* p, int channels, int sugRate, bool pal) {
+  parent=p;
+  if (pal) {
+    rate=500000;
+  } else {
+    rate=500000;
+  }
+  iface.parent=parent;
+  iface.sampleBank=0;
+  fm=new ymfm::ym2610(iface);
+  reset();
   return 10;
 }
diff --git a/src/engine/platform/ym2610.h b/src/engine/platform/ym2610.h
index 4df404bda..dfa86f216 100644
--- a/src/engine/platform/ym2610.h
+++ b/src/engine/platform/ym2610.h
@@ -61,6 +61,7 @@ class DivPlatformYM2610: public DivDispatch {
   public:
     void acquire(short* bufL, short* bufR, size_t start, size_t len);
     int dispatch(DivCommand c);
+    void reset();
     void tick();
     bool isStereo();
     bool keyOffAffectsArp(int ch);
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index be7078479..3e3791eee 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -774,6 +774,11 @@ bool DivEngine::nextTick() {
 }
 
 void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsigned int size) {
+  if (!playing) {
+    memset(out[0],0,size*sizeof(float));
+    memset(out[1],0,size*sizeof(float));
+    return;
+  }
   size_t runtotal=blip_clocks_needed(bb[0],size);
 
   if (runtotal>bbInLen) {
@@ -787,6 +792,7 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
   size_t runLeft=runtotal;
   size_t runPos=0;
   totalProcessed=0;
+  isBusy.lock();
   while (runLeft) {
     if (!remainingLoops) {
       memset(bbIn[0]+runPos,0,runLeft*sizeof(short));
@@ -811,6 +817,7 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
       }
     }
   }
+  isBusy.unlock();
   totalProcessed=(1+runPos)*got.rate/dispatch->rate;
 
   for (size_t i=0; i<runtotal; i++) {
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 47c6d3dd5..41252c862 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -28,6 +28,16 @@ bool FurnaceGUI::loop() {
       ImGui::Text("Hello world!\n");
       ImGui::InputScalar("Speed 1",ImGuiDataType_U8,&e->song.speed1);
       ImGui::InputScalar("Speed 2",ImGuiDataType_U8,&e->song.speed2);
+      unsigned char ord=e->getOrder();
+      if (ImGui::InputScalar("Order",ImGuiDataType_U8,&ord)) {
+        e->setOrder(ord);
+      }
+      if (ImGui::Button("Play")) {
+        e->play();
+      }
+      if (ImGui::Button("Stop")) {
+        e->stop();
+      }
     }
     ImGui::End();