diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 964e220d8..57fb8b144 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -646,10 +646,11 @@ if( NOT SEND_ANON_STATS )
 endif()
 
 # OPLMIDI needs for USE_LEGACY_EMULATOR macro to be correctly built
-add_definitions(-DUSE_LEGACY_EMULATOR)
+add_definitions(-DOPNMIDI_USE_LEGACY_EMULATOR)
 
-# Disable ADLMIDI's MIDI Sequencer, MUS and XMI converters
+# Disable ADLMIDI's and OPNMIDI's MIDI Sequencer, MUS and XMI converters
 add_definitions(-DADLMIDI_DISABLE_MUS_SUPPORT -DADLMIDI_DISABLE_XMI_SUPPORT -DADLMIDI_DISABLE_MIDI_SEQUENCER)
+add_definitions(-DOPNMIDI_DISABLE_MUS_SUPPORT -DOPNMIDI_DISABLE_XMI_SUPPORT -DOPNMIDI_DISABLE_MIDI_SEQUENCER)
 
 # Project files should be aware of the header files. We can GLOB these since
 # there's generally a new cpp for every header so this file will get changed
diff --git a/src/sound/opnmidi/opnmidi.cpp b/src/sound/opnmidi/opnmidi.cpp
index 61a7e8346..6657ee2f5 100644
--- a/src/sound/opnmidi/opnmidi.cpp
+++ b/src/sound/opnmidi/opnmidi.cpp
@@ -160,6 +160,7 @@ OPNMIDI_EXPORT int opn2_openFile(OPN2_MIDIPlayer *device, const char *filePath)
     if(device && device->opn2_midiPlayer)
     {
         OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
         play->m_setup.tick_skip_samples_delay = 0;
         if(!play->LoadMIDI(filePath))
         {
@@ -169,6 +170,11 @@ OPNMIDI_EXPORT int opn2_openFile(OPN2_MIDIPlayer *device, const char *filePath)
             return -1;
         }
         else return 0;
+#else
+        (void)filePath;
+        play->setErrorString("OPNMIDI: MIDI Sequencer is not supported in this build of library!");
+        return -1;
+#endif
     }
 
     OPN2MIDI_ErrorString = "Can't load file: OPN2 MIDI is not initialized";
@@ -180,6 +186,7 @@ OPNMIDI_EXPORT int opn2_openData(OPN2_MIDIPlayer *device, const void *mem, unsig
     if(device && device->opn2_midiPlayer)
     {
         OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
         play->m_setup.tick_skip_samples_delay = 0;
         if(!play->LoadMIDI(mem, static_cast<size_t>(size)))
         {
@@ -189,6 +196,11 @@ OPNMIDI_EXPORT int opn2_openData(OPN2_MIDIPlayer *device, const void *mem, unsig
             return -1;
         }
         else return 0;
+#else
+        (void)mem;(void)size;
+        play->setErrorString("OPNMIDI: MIDI Sequencer is not supported in this build of library!");
+        return -1;
+#endif
     }
 
     OPN2MIDI_ErrorString = "Can't load file: OPN2 MIDI is not initialized";
@@ -197,7 +209,7 @@ OPNMIDI_EXPORT int opn2_openData(OPN2_MIDIPlayer *device, const void *mem, unsig
 
 OPNMIDI_EXPORT const char *opn2_emulatorName()
 {
-    #ifdef USE_LEGACY_EMULATOR
+    #ifdef OPNMIDI_USE_LEGACY_EMULATOR
     return "GENS 2.10 YM2612";
     #else
     return "Nuked OPN2 YM3438";
@@ -233,10 +245,14 @@ OPNMIDI_EXPORT const char *opn2_getMusicTitle(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return "";
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(!play)
         return "";
     return play->musTitle.c_str();
+#else
+    return "";
+#endif
 }
 
 OPNMIDI_EXPORT void opn2_close(OPN2_MIDIPlayer *device)
@@ -263,10 +279,12 @@ OPNMIDI_EXPORT double opn2_totalTimeLength(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return -1.0;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
         return play->timeLength();
     else
+#endif
         return -1.0;
 }
 
@@ -274,10 +292,12 @@ OPNMIDI_EXPORT double opn2_loopStartTime(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return -1.0;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
         return play->getLoopStart();
     else
+#endif
         return -1.0;
 }
 
@@ -285,10 +305,12 @@ OPNMIDI_EXPORT double opn2_loopEndTime(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return -1.0;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
         return play->getLoopEnd();
     else
+#endif
         return -1.0;
 }
 
@@ -296,10 +318,12 @@ OPNMIDI_EXPORT double opn2_positionTell(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return -1.0;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
         return play->tell();
     else
+#endif
         return -1.0;
 }
 
@@ -307,27 +331,35 @@ OPNMIDI_EXPORT void opn2_positionSeek(struct OPN2_MIDIPlayer *device, double sec
 {
     if(!device)
         return;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
-        return play->seek(seconds);
+        play->seek(seconds);
+#else
+    (void)seconds;
+#endif
 }
 
 OPNMIDI_EXPORT void opn2_positionRewind(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
-        return play->rewind();
+        play->rewind();
+#endif
 }
 
 OPNMIDI_EXPORT void opn2_setTempo(struct OPN2_MIDIPlayer *device, double tempo)
 {
     if(!device || (tempo <= 0.0))
         return;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
-        return play->setTempo(tempo);
+        play->setTempo(tempo);
+#endif
 }
 
 
@@ -336,10 +368,12 @@ OPNMIDI_EXPORT const char *opn2_metaMusicTitle(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return "";
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
         return play->musTitle.c_str();
     else
+#endif
         return "";
 }
 
@@ -348,10 +382,12 @@ OPNMIDI_EXPORT const char *opn2_metaMusicCopyright(struct OPN2_MIDIPlayer *devic
 {
     if(!device)
         return "";
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
         return play->musCopyright.c_str();
     else
+#endif
         return "";
 }
 
@@ -359,10 +395,12 @@ OPNMIDI_EXPORT size_t opn2_metaTrackTitleCount(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return 0;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
         return play->musTrackTitles.size();
     else
+#endif
         return 0;
 }
 
@@ -370,10 +408,15 @@ OPNMIDI_EXPORT const char *opn2_metaTrackTitle(struct OPN2_MIDIPlayer *device, s
 {
     if(!device)
         return 0;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(index >= play->musTrackTitles.size())
         return "INVALID";
     return play->musTrackTitles[index].c_str();
+#else
+    (void)index;
+    return "NOT SUPPORTED";
+#endif
 }
 
 
@@ -381,16 +424,19 @@ OPNMIDI_EXPORT size_t opn2_metaMarkerCount(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return 0;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(play)
         return play->musMarkers.size();
     else
+#endif
         return 0;
 }
 
 OPNMIDI_EXPORT Opn2_MarkerEntry opn2_metaMarker(struct OPN2_MIDIPlayer *device, size_t index)
 {
     struct Opn2_MarkerEntry marker;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *play = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(!device || !play || (index >= play->musMarkers.size()))
     {
@@ -406,6 +452,12 @@ OPNMIDI_EXPORT Opn2_MarkerEntry opn2_metaMarker(struct OPN2_MIDIPlayer *device,
         marker.pos_time = mk.pos_time;
         marker.pos_ticks = (unsigned long)mk.pos_ticks;
     }
+#else
+    (void)device; (void)index;
+    marker.label = "NOT SUPPORTED";
+    marker.pos_time = 0.0;
+    marker.pos_ticks = 0;
+#endif
     return marker;
 }
 
@@ -458,6 +510,7 @@ inline static void SendStereoAudio(int      &samples_requested,
 
 OPNMIDI_EXPORT int opn2_play(OPN2_MIDIPlayer *device, int sampleCount, short *out)
 {
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     sampleCount -= sampleCount % 2; //Avoid even sample requests
     if(sampleCount < 0)
         return 0;
@@ -514,7 +567,7 @@ OPNMIDI_EXPORT int opn2_play(OPN2_MIDIPlayer *device, int sampleCount, short *ou
                 unsigned int chips = player->opn.NumCards;
                 if(chips == 1)
                 {
-                    #ifdef USE_LEGACY_EMULATOR
+                    #ifdef OPNMIDI_USE_LEGACY_EMULATOR
                     player->opn.cardsOP2[0]->run(int(in_generatedStereo), out_buf);
                     #else
                     OPN2_GenerateStream(player->opn.cardsOP2[0], out_buf, (Bit32u)in_generatedStereo);
@@ -525,7 +578,7 @@ OPNMIDI_EXPORT int opn2_play(OPN2_MIDIPlayer *device, int sampleCount, short *ou
                     /* Generate data from every chip and mix result */
                     for(unsigned card = 0; card < chips; ++card)
                     {
-                        #ifdef USE_LEGACY_EMULATOR
+                        #ifdef OPNMIDI_USE_LEGACY_EMULATOR
                         player->opn.cardsOP2[card]->run(int(in_generatedStereo), out_buf);
                         #else
                         OPN2_GenerateStreamMix(player->opn.cardsOP2[card], out_buf, (Bit32u)in_generatedStereo);
@@ -549,6 +602,9 @@ OPNMIDI_EXPORT int opn2_play(OPN2_MIDIPlayer *device, int sampleCount, short *ou
     }
 
     return static_cast<int>(gotten_len);
+#else
+    return 0;
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 }
 
 
@@ -593,7 +649,7 @@ OPNMIDI_EXPORT int opn2_generate(struct OPN2_MIDIPlayer *device, int sampleCount
                 unsigned int chips = player->opn.NumCards;
                 if(chips == 1)
                 {
-                    #ifdef USE_LEGACY_EMULATOR
+                    #ifdef OPNMIDI_USE_LEGACY_EMULATOR
                     player->opn.cardsOP2[0]->run(int(in_generatedStereo), out_buf);
                     #else
                     OPN2_GenerateStream(player->opn.cardsOP2[0], out_buf, (Bit32u)in_generatedStereo);
@@ -604,7 +660,7 @@ OPNMIDI_EXPORT int opn2_generate(struct OPN2_MIDIPlayer *device, int sampleCount
                     /* Generate data from every chip and mix result */
                     for(unsigned card = 0; card < chips; ++card)
                     {
-                        #ifdef USE_LEGACY_EMULATOR
+                        #ifdef OPNMIDI_USE_LEGACY_EMULATOR
                         player->opn.cardsOP2[card]->run(int(in_generatedStereo), out_buf);
                         #else
                         OPN2_GenerateStreamMix(player->opn.cardsOP2[card], out_buf, (Bit32u)in_generatedStereo);
@@ -629,20 +685,29 @@ OPNMIDI_EXPORT double opn2_tickEvents(struct OPN2_MIDIPlayer *device, double sec
 {
     if(!device)
         return -1.0;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *player = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(!player)
         return -1.0;
     return player->Tick(seconds, granuality);
+#else
+    (void)seconds; (void)granuality;
+    return -1.0;
+#endif
 }
 
 OPNMIDI_EXPORT int opn2_atEnd(struct OPN2_MIDIPlayer *device)
 {
     if(!device)
         return 1;
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     OPNMIDIplay *player = reinterpret_cast<OPNMIDIplay *>(device->opn2_midiPlayer);
     if(!player)
         return 1;
     return (int)player->atEnd;
+#else
+    return 1;
+#endif
 }
 
 OPNMIDI_EXPORT void opn2_panic(struct OPN2_MIDIPlayer *device)
diff --git a/src/sound/opnmidi/opnmidi.h b/src/sound/opnmidi/opnmidi.h
index 5988e5dc1..f9c61d648 100644
--- a/src/sound/opnmidi/opnmidi.h
+++ b/src/sound/opnmidi/opnmidi.h
@@ -30,7 +30,7 @@ extern "C" {
 
 #define OPNMIDI_VERSION_MAJOR       1
 #define OPNMIDI_VERSION_MINOR       1
-#define OPNMIDI_VERSION_PATCHLEVEL  0
+#define OPNMIDI_VERSION_PATCHLEVEL  1
 
 #define OPNMIDI_TOSTR(s) #s
 #define OPNMIDI_VERSION \
diff --git a/src/sound/opnmidi/opnmidi_load.cpp b/src/sound/opnmidi/opnmidi_load.cpp
index 17795c87d..8e87cabc8 100644
--- a/src/sound/opnmidi/opnmidi_load.cpp
+++ b/src/sound/opnmidi/opnmidi_load.cpp
@@ -23,6 +23,15 @@
 
 #include "opnmidi_private.hpp"
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
+#   ifndef OPNMIDI_DISABLE_MUS_SUPPORT
+#       include "opnmidi_mus2mid.h"
+#   endif
+#   ifndef OPNMIDI_DISABLE_XMI_SUPPORT
+#       include "opnmidi_xmi2mid.h"
+#   endif
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
+
 uint64_t OPNMIDIplay::ReadBEint(const void *buffer, size_t nbytes)
 {
     uint64_t result = 0;
@@ -299,6 +308,7 @@ bool OPNMIDIplay::LoadBank(OPNMIDIplay::fileReader &fr)
     return true;
 }
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
 bool OPNMIDIplay::LoadMIDI(const std::string &filename)
 {
     fileReader file;
@@ -367,6 +377,83 @@ riffskip:
         fr.seek(7 - static_cast<long>(HeaderSize), SEEK_CUR);
         is_GMF = true;
     }
+
+    #ifndef OPNMIDI_DISABLE_MUS_SUPPORT
+    else if(std::memcmp(HeaderBuf, "MUS\x1A", 4) == 0)
+    {
+        // MUS/DMX files (Doom)
+        fr.seek(0, SEEK_END);
+        size_t mus_len = fr.tell();
+        fr.seek(0, SEEK_SET);
+        uint8_t *mus = (uint8_t *)malloc(mus_len);
+        if(!mus)
+        {
+            errorStringOut = "Out of memory!";
+            return false;
+        }
+        fr.read(mus, 1, mus_len);
+        //Close source stream
+        fr.close();
+
+        uint8_t *mid = NULL;
+        uint32_t mid_len = 0;
+        int m2mret = OpnMidi_mus2midi(mus, static_cast<uint32_t>(mus_len),
+                                      &mid, &mid_len, 0);
+        if(mus) free(mus);
+        if(m2mret < 0)
+        {
+            errorStringOut = "Invalid MUS/DMX data format!";
+            return false;
+        }
+        cvt_buf.reset(mid);
+        //Open converted MIDI file
+        fr.openData(mid, static_cast<size_t>(mid_len));
+        //Re-Read header again!
+        goto riffskip;
+    }
+    #endif //OPNMIDI_DISABLE_MUS_SUPPORT
+
+    #ifndef OPNMIDI_DISABLE_XMI_SUPPORT
+    else if(std::memcmp(HeaderBuf, "FORM", 4) == 0)
+    {
+        if(std::memcmp(HeaderBuf + 8, "XDIR", 4) != 0)
+        {
+            fr.close();
+            errorStringOut = fr._fileName + ": Invalid format\n";
+            return false;
+        }
+
+        fr.seek(0, SEEK_END);
+        size_t mus_len = fr.tell();
+        fr.seek(0, SEEK_SET);
+        uint8_t *mus = (uint8_t*)malloc(mus_len);
+        if(!mus)
+        {
+            errorStringOut = "Out of memory!";
+            return false;
+        }
+        fr.read(mus, 1, mus_len);
+        //Close source stream
+        fr.close();
+
+        uint8_t *mid = NULL;
+        uint32_t mid_len = 0;
+        int m2mret = OpnMidi_xmi2midi(mus, static_cast<uint32_t>(mus_len),
+                                      &mid, &mid_len, XMIDI_CONVERT_NOCONVERSION);
+        if(mus) free(mus);
+        if(m2mret < 0)
+        {
+            errorStringOut = "Invalid XMI data format!";
+            return false;
+        }
+        cvt_buf.reset(mid);
+        //Open converted MIDI file
+        fr.openData(mid, static_cast<size_t>(mid_len));
+        //Re-Read header again!
+        goto riffskip;
+    }
+    #endif //OPNMIDI_DISABLE_XMI_SUPPORT
+
     else
     {
         // Try to identify RSXX format
@@ -482,3 +569,4 @@ riffskip:
     ch.resize(opn.NumChannels);
     return true;
 }
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
diff --git a/src/sound/opnmidi/opnmidi_midiplay.cpp b/src/sound/opnmidi/opnmidi_midiplay.cpp
index 8495a5831..50bc21742 100644
--- a/src/sound/opnmidi/opnmidi_midiplay.cpp
+++ b/src/sound/opnmidi/opnmidi_midiplay.cpp
@@ -93,6 +93,8 @@ void OPNMIDIplay::OpnChannel::AddAge(int64_t ms)
     }
 }
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
+
 OPNMIDIplay::MidiEvent::MidiEvent() :
     type(T_UNKNOWN),
     subtype(T_UNKNOWN),
@@ -211,7 +213,9 @@ void OPNMIDIplay::MidiTrackRow::sortEvents(bool *noteStates)
     events.insert(events.end(), controllers.begin(), controllers.end());
     events.insert(events.end(), anyOther.begin(), anyOther.end());
 }
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
 bool OPNMIDIplay::buildTrackData()
 {
     fullSongTimeLength = 0.0;
@@ -648,12 +652,12 @@ bool OPNMIDIplay::buildTrackData()
 
     return true;
 }
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 
 
-
-OPNMIDIplay::OPNMIDIplay(unsigned long sampleRate):
-    //cmf_percussion_mode(false),
-    fullSongTimeLength(0.0),
+OPNMIDIplay::OPNMIDIplay(unsigned long sampleRate)
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
+    : fullSongTimeLength(0.0),
     postSongWaitDelay(1.0),
     loopStartTime(-1.0),
     loopEndTime(-1.0),
@@ -662,6 +666,7 @@ OPNMIDIplay::OPNMIDIplay(unsigned long sampleRate):
     loopStart(false),
     loopEnd(false),
     invalidLoop(false)
+#endif
 {
     devices.clear();
 
@@ -735,7 +740,7 @@ uint64_t OPNMIDIplay::ReadVarLenEx(uint8_t **ptr, uint8_t *end, bool &ok)
     return result;
 }
 
-
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
 double OPNMIDIplay::Tick(double s, double granularity)
 {
     s *= tempoMultiplier;
@@ -770,6 +775,7 @@ double OPNMIDIplay::Tick(double s, double granularity)
 
     return CurrentPositionNew.wait;
 }
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 
 void OPNMIDIplay::TickIteratos(double s)
 {
@@ -779,6 +785,7 @@ void OPNMIDIplay::TickIteratos(double s)
     UpdateArpeggio(s);
 }
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
 void OPNMIDIplay::seek(double seconds)
 {
     if(seconds < 0.0)
@@ -884,6 +891,7 @@ void OPNMIDIplay::setTempo(double tempo)
 {
     tempoMultiplier = tempo;
 }
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 
 void OPNMIDIplay::realTime_ResetState()
 {
@@ -1534,7 +1542,7 @@ void OPNMIDIplay::NoteUpdate(uint16_t MidCh,
         Ch[MidCh].activenotes.erase(i);
 }
 
-
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
 bool OPNMIDIplay::ProcessEventsNew(bool isSeek)
 {
     if(CurrentPositionNew.track.size() == 0)
@@ -1646,7 +1654,9 @@ bool OPNMIDIplay::ProcessEventsNew(bool isSeek)
 
     return true;//Has events in queue
 }
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
 OPNMIDIplay::MidiEvent OPNMIDIplay::parseEvent(uint8_t **pptr, uint8_t *end, int &status)
 {
     uint8_t *&ptr = *pptr;
@@ -1850,6 +1860,7 @@ OPNMIDIplay::MidiEvent OPNMIDIplay::parseEvent(uint8_t **pptr, uint8_t *end, int
 
     return evt;
 }
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 
 const std::string &OPNMIDIplay::getErrorString()
 {
@@ -1861,7 +1872,7 @@ void OPNMIDIplay::setErrorString(const std::string &err)
     errorStringOut = err;
 }
 
-
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
 void OPNMIDIplay::HandleEvent(size_t tk, const OPNMIDIplay::MidiEvent &evt, int &status)
 {
     if(hooks.onEvent)
@@ -2018,6 +2029,7 @@ void OPNMIDIplay::HandleEvent(size_t tk, const OPNMIDIplay::MidiEvent &evt, int
     }
     }
 }
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 
 long OPNMIDIplay::CalculateAdlChannelGoodness(size_t c, uint16_t ins, uint16_t) const
 {
diff --git a/src/sound/opnmidi/opnmidi_opn2.cpp b/src/sound/opnmidi/opnmidi_opn2.cpp
index 17182def1..398ba8980 100644
--- a/src/sound/opnmidi/opnmidi_opn2.cpp
+++ b/src/sound/opnmidi/opnmidi_opn2.cpp
@@ -81,7 +81,7 @@ OPN2::~OPN2()
 
 void OPN2::PokeO(size_t card, uint8_t port, uint8_t index, uint8_t value)
 {
-    #ifdef USE_LEGACY_EMULATOR
+    #ifdef OPNMIDI_USE_LEGACY_EMULATOR
     if(port == 1)
         cardsOP2[card]->write1(index, value);
     else
@@ -281,12 +281,12 @@ void OPN2::Reset(unsigned long PCM_RATE)
     regBD.clear();
     cardsOP2.resize(NumCards, NULL);
 
-    #ifndef USE_LEGACY_EMULATOR
+    #ifndef OPNMIDI_USE_LEGACY_EMULATOR
     OPN2_SetChipType(ym3438_type_asic);
     #endif
     for(size_t i = 0; i < cardsOP2.size(); i++)
     {
-    #ifdef USE_LEGACY_EMULATOR
+    #ifdef OPNMIDI_USE_LEGACY_EMULATOR
         cardsOP2[i] = new OPNMIDI_Ym2612_Emu();
         cardsOP2[i]->set_rate(PCM_RATE, 7670454.0);
     #else
diff --git a/src/sound/opnmidi/opnmidi_private.hpp b/src/sound/opnmidi/opnmidi_private.hpp
index 98f61fc00..a41216f1b 100644
--- a/src/sound/opnmidi/opnmidi_private.hpp
+++ b/src/sound/opnmidi/opnmidi_private.hpp
@@ -49,6 +49,10 @@ typedef __int32 ssize_t;
 #   include <windows.h>
 #endif
 
+#ifdef USE_LEGACY_EMULATOR // Kept for a backward compatibility
+#define OPNMIDI_USE_LEGACY_EMULATOR
+#endif
+
 #include <vector>
 #include <list>
 #include <string>
@@ -75,7 +79,7 @@ typedef __int32 ssize_t;
 #include <algorithm>
 
 #include "fraction.hpp"
-#ifdef USE_LEGACY_EMULATOR
+#ifdef OPNMIDI_USE_LEGACY_EMULATOR
 #include "Ym2612_ChipEmu.h"
 #else
 #include "ym3438.h"
@@ -131,7 +135,7 @@ public:
     friend class OPNMIDIplay;
     uint32_t NumChannels;
     char ____padding[4];
-#ifdef USE_LEGACY_EMULATOR
+#ifdef OPNMIDI_USE_LEGACY_EMULATOR
     std::vector<OPNMIDI_Ym2612_Emu*> cardsOP2;
 #else
     std::vector<ym3438_t*> cardsOP2;
@@ -508,6 +512,7 @@ public:
         void AddAge(int64_t ms);
     };
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     /**
      * @brief MIDI Event utility container
      */
@@ -632,6 +637,7 @@ public:
         PositionNew(): began(false), wait(0.0), absTimePosition(0.0), track()
         {}
     };
+#endif //OPNMIDI_DISABLE_MIDI_SEQUENCER
 
     struct Setup
     {
@@ -675,6 +681,8 @@ private:
     std::map<uint64_t /*track*/, uint64_t /*channel begin index*/> current_device;
 
     std::vector<OpnChannel> ch;
+
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     std::vector<std::vector<uint8_t> > TrackData;
 
     PositionNew CurrentPositionNew, LoopBeginPositionNew, trackBeginPositionNew;
@@ -688,13 +696,16 @@ private:
     double loopStartTime;
     //! Loop end time
     double loopEndTime;
+#endif
     //! Local error string
     std::string errorString;
     //! Local error string
     std::string errorStringOut;
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     //! Pre-processed track data storage
     std::vector<MidiTrackQueue > trackDataNew;
+#endif
 
     //! Missing instruments catches
     std::set<uint8_t> caugh_missing_instruments;
@@ -703,6 +714,7 @@ private:
     //! Missing percussion banks catches
     std::set<uint16_t> caugh_missing_banks_percussion;
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     /**
      * @brief Build MIDI track data from the raw track data storage
      * @return true if everything successfully processed, or false on any error
@@ -717,12 +729,14 @@ private:
      * @return Parsed MIDI event entry
      */
     MidiEvent parseEvent(uint8_t **ptr, uint8_t *end, int &status);
+#endif
 
 public:
 
     const std::string &getErrorString();
     void setErrorString(const std::string &err);
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     std::string musTitle;
     std::string musCopyright;
     std::vector<std::string> musTrackTitles;
@@ -736,6 +750,7 @@ public:
             loopEnd,
             invalidLoop; /*Loop points are invalid (loopStart after loopEnd or loopStart and loopEnd are on same place)*/
     char ____padding2[2];
+#endif
     OPN2 opn;
 
     int16_t outBuf[1024];
@@ -764,6 +779,7 @@ public:
     bool LoadBank(const void *data, size_t size);
     bool LoadBank(fileReader &fr);
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     bool LoadMIDI(const std::string &filename);
     bool LoadMIDI(const void *data, size_t size);
     bool LoadMIDI(fileReader &fr);
@@ -775,6 +791,7 @@ public:
      * @return desired number of seconds until next call
      */
     double Tick(double s, double granularity);
+#endif
 
     /**
      * @brief Process extra iterators like vibrato or arpeggio
@@ -782,6 +799,7 @@ public:
      */
     void   TickIteratos(double s);
 
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     /**
      * @brief Change current position to specified time position in seconds
      * @param seconds Absolute time position in seconds
@@ -822,6 +840,7 @@ public:
      * @param tempo Tempo multiplier: 1.0 - original tempo. >1 - faster, <1 - slower
      */
     void    setTempo(double tempo);
+#endif
 
     /* RealTime event triggers */
     void realTime_ResetState();
@@ -860,8 +879,11 @@ private:
                     MIDIchannel::activenoteiterator i,
                     unsigned props_mask,
                     int32_t select_adlchn = -1);
+
+#ifndef OPNMIDI_DISABLE_MIDI_SEQUENCER
     bool ProcessEventsNew(bool isSeek = false);
     void HandleEvent(size_t tk, const MidiEvent &evt, int &status);
+#endif
 
     // Determine how good a candidate this adlchannel
     // would be for playing a note from this instrument.