diff --git a/mscore/driver.h b/mscore/driver.h
index a892910c33baf..6f63201c3860d 100644
--- a/mscore/driver.h
+++ b/mscore/driver.h
@@ -25,6 +25,7 @@ namespace Ms {
 
 class Seq;
 class Event;
+class NPlayEvent;
 
 //---------------------------------------------------------
 //   Driver
@@ -48,7 +49,7 @@ class Driver {
       virtual int sampleRate() const = 0;
       virtual void registerPort(const QString& /*name*/, bool /*input*/, bool /*midi*/) {}
       virtual void unregisterPort(int) {}
-      virtual void putEvent(const Event&, unsigned /*framePos*/) {}
+      virtual void putEvent(const NPlayEvent&, unsigned /*framePos*/) {}
       virtual void midiRead() {}
       };
 
diff --git a/mscore/jackaudio.cpp b/mscore/jackaudio.cpp
index 92ce122ffb0c9..1f694e9ec8369 100644
--- a/mscore/jackaudio.cpp
+++ b/mscore/jackaudio.cpp
@@ -46,6 +46,7 @@ JackAudio::JackAudio(Seq* s)
 JackAudio::~JackAudio()
       {
       if (client) {
+            stop();
             if (jack_client_close(client)) {
                   qDebug("jack_client_close() failed: %s",
                      strerror(errno));
@@ -226,7 +227,7 @@ bool JackAudio::stop()
       {
       if (preferences.useJackMidi && preferences.rememberLastMidiConnections) {
             QSettings settings;
-            settings.setValue("midiPorts", midiOutputPorts.size());
+            //settings.setValue("midiPorts", midiOutputPorts.size());
             int port = 0;
             foreach(jack_port_t* mp, midiOutputPorts) {
                   const char** cc = jack_port_get_connections(mp);
@@ -243,7 +244,8 @@ bool JackAudio::stop()
                   free((void*)cc);
                   ++port;
                   }
-            settings.setValue("midiInputPorts", midiInputPorts.size());
+            // We don't use it now
+            //settings.setValue("midiInputPorts", midiInputPorts.size());
             port = 0;
             foreach(jack_port_t* mp, midiInputPorts) {
                   const char** cc = jack_port_get_connections(mp);
@@ -374,6 +376,11 @@ int JackAudio::processAudio(jack_nframes_t frames, void* p)
                   *r++ = *sp++;
                   }
             }
+      else {
+            // JACK MIDI only
+            float buffer[frames * 2];
+            audio->seq->process((unsigned)frames, buffer);
+            }
       return 0;
       }
 
@@ -390,8 +397,9 @@ static void jackError(const char *s)
 //   noJackError
 //---------------------------------------------------------
 
-static void noJackError(const char* /* s */)
+static void noJackError(const char*  s )
       {
+      qDebug("noJACK ERROR: %s", s);
       }
 
 //---------------------------------------------------------
@@ -504,7 +512,7 @@ int JackAudio::getState()
 //   putEvent
 //---------------------------------------------------------
 
-void JackAudio::putEvent(const Event& e, unsigned framePos)
+void JackAudio::putEvent(const NPlayEvent& e, unsigned framePos)
       {
       if (!preferences.useJackMidi)
             return;
@@ -562,7 +570,8 @@ void JackAudio::putEvent(const Event& e, unsigned framePos)
                   p[1] = e.dataA();
                   }
                   break;
-            case ME_SYSEX:
+          // Do we really need to handle ME_SYSEX?
+          /*  case ME_SYSEX:
                   {
                   const unsigned char* data = e.edata();
                   int len = e.len();
@@ -575,7 +584,7 @@ void JackAudio::putEvent(const Event& e, unsigned framePos)
                   p[len+1] = 0xf7;
                   memcpy(p+1, data, len);
                   }
-                  break;
+                  break;*/
             case ME_SONGPOS:
             case ME_CLOCK:
             case ME_START:
diff --git a/mscore/jackaudio.h b/mscore/jackaudio.h
index f3159c29e189c..534f8261a6514 100644
--- a/mscore/jackaudio.h
+++ b/mscore/jackaudio.h
@@ -62,7 +62,7 @@ class JackAudio : public Driver {
       virtual void stopTransport();
       virtual int getState();
       virtual int sampleRate() const    { return jack_get_sample_rate(client); }
-      virtual void putEvent(const Event&, unsigned framePos);
+      virtual void putEvent(const NPlayEvent&, unsigned framePos);
       virtual void midiRead();
 
       virtual void registerPort(const QString& name, bool input, bool midi);
diff --git a/mscore/preferences.cpp b/mscore/preferences.cpp
index 31c1ea2fd0f92..4ee6d8c8d3542 100644
--- a/mscore/preferences.cpp
+++ b/mscore/preferences.cpp
@@ -827,6 +827,7 @@ void PreferenceDialog::updateValues()
       portaudioDriver->setChecked(prefs.usePortaudioAudio);
       pulseaudioDriver->setChecked(prefs.usePulseAudio);
       useJackMidi->setChecked(prefs.useJackMidi);
+      useSynthesizer->setChecked(prefs.useAlsaAudio || prefs.useJackAudio || prefs.usePortaudioAudio || prefs.usePulseAudio);
 
       alsaDevice->setText(prefs.alsaDevice);
 
diff --git a/mscore/seq.cpp b/mscore/seq.cpp
index be2cf1794ca67..81556545816b4 100644
--- a/mscore/seq.cpp
+++ b/mscore/seq.cpp
@@ -652,6 +652,11 @@ void Seq::process(unsigned n, float* buffer)
       if (driverState != state) {
             if (state == TRANSPORT_STOP && driverState == TRANSPORT_PLAY) {
                   state = TRANSPORT_PLAY;
+                  // Changing GUI
+                  if((preferences.useJackMidi || preferences.useJackAudio) && !getAction("play")->isChecked()) {
+                        getAction("play")->setChecked(true);
+                        getAction("play")->triggered(true);
+                        }
                   if (mscore->countIn() && cs->playMode() == PLAYMODE_SYNTHESIZER) {
                         countInEvents.clear();
                         inCountIn = true;
@@ -660,10 +665,17 @@ void Seq::process(unsigned n, float* buffer)
                   }
             else if (state == TRANSPORT_PLAY && driverState == TRANSPORT_STOP) {
                   state = TRANSPORT_STOP;
-                  stopNotes();
-                  // send sustain off
-                  // TODO: channel?
-                  putEvent(NPlayEvent(ME_CONTROLLER, 0, CTRL_SUSTAIN, 0));
+                  // Muting all notes
+                  if(preferences.useAlsaAudio || preferences.useJackAudio || preferences.usePulseAudio || preferences.usePortaudioAudio || preferences.useOsc)
+                        stopNotes();
+                  if(preferences.useJackMidi)
+                        for(int ch=0; ch<cs->midiMapping()->size();ch++) {
+                              // send sustain off
+                              putEvent(NPlayEvent(ME_CONTROLLER, ch, CTRL_SUSTAIN, 0));
+                              for(int i=0; i<128; i++)
+                                    putEvent(NPlayEvent(ME_NOTEOFF,ch,i,0));
+                              }
+
                   if (playPos == events.cend()) {
                         if (mscore->loop()) {
                               qDebug("Seq.cpp - Process - Loop whole score. playPos = %d     cs->pos() = %d", playPos->first,cs->pos());
@@ -1237,6 +1249,8 @@ void Seq::putEvent(const NPlayEvent& event)
             }
       int syntiIdx= _synti->index(cs->midiMapping(channel)->articulation->synti);
       _synti->play(event, syntiIdx);
+      if (preferences.useJackMidi)
+            driver()->putEvent(event,0);
       }
 
 //---------------------------------------------------------