diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06e9f078..12bc768c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,6 @@ set(ENGINE_SOURCES
 src/log.cpp
 
 extern/Nuked-OPN2/ym3438.c
-extern/Nuked-OPM/opm.c
 src/engine/platform/sound/sn76496.cpp
 src/engine/platform/sound/gb/apu.c
 src/engine/platform/sound/gb/timing.c
diff --git a/src/audio/file.cpp b/src/audio/file.cpp
deleted file mode 100644
index 1b22dcaa..00000000
--- a/src/audio/file.cpp
+++ /dev/null
@@ -1,99 +0,0 @@
-#include <sndfile.h>
-#include <string.h>
-#include "file.h"
-#include "taAudio.h"
-
-void TAAudioFile::onProcess(unsigned char* buf, int nframes) {
-  if (audioProcCallback!=NULL) {
-    audioProcCallback(audioProcCallbackUser,inBufs,outBufs,desc.inChans,desc.outChans,desc.bufsize);
-  }
-  /*
-  float* fbuf=(float*)buf;
-  for (size_t j=0; j<desc.bufsize; j++) {
-    for (size_t i=0; i<desc.outChans; i++) {
-      fbuf[j*desc.outChans+i]=outBufs[i][j];
-    }
-  }*/
-}
-
-void* TAAudioFile::getContext() {
-  return file;
-}
-
-bool TAAudioFile::quit() {
-  if (!initialized) return false;
-
-  if (file!=NULL) {
-    sf_close(file);
-    file=NULL;
-  }
-
-  if (running) {
-    running=false;
-  }
-
-  for (int i=0; i<desc.outChans; i++) {
-    delete[] outBufs[i];
-  }
-
-  delete[] outBufs;
-  
-  initialized=false;
-  return true;
-}
-
-bool TAAudioFile::setRun(bool run) {
-  if (!initialized) return false;
-  SDL_PauseAudioDevice(ai,!run);
-  running=run;
-  return running;
-}
-
-bool TAAudioFile::init(TAAudioDesc& request, TAAudioDesc& response) {
-  if (initialized) return false;
-
-  TAAudioDesc desc=request;
-
-  if (desc.inChans>0) return false;
-
-  memset(si,0,sizeof(SF_INFO));
-  si.channels=request.outChans;
-  si.samplerate=request.rate;
-  switch (request.outFormat) {
-    case TA_AUDIO_FORMAT_F32:
-      si.format=SF_FORMAT_FLOAT;
-      break;
-    case TA_AUDIO_FORMAT_F64:
-      si.format=SF_FORMAT_DOUBLE;
-      break;
-    case TA_AUDIO_FORMAT_U8:
-      si.format=SF_FORMAT_PCM_U8;
-      break;
-    case TA_AUDIO_FORMAT_S8:
-      si.format=SF_FORMAT_PCM_S8;
-      break;
-    case TA_AUDIO_FORMAT_S16:
-      si.format=SF_FORMAT_PCM_16;
-      break;
-    case TA_AUDIO_FORMAT_S32:
-      si.format=SF_FORMAT_PCM_32;
-      break;
-    default:
-      return false;
-  }
-  si.format|=SF_FORMAT_WAV;
-
-  file=sf_open(request.name.c_str(),SFM_WRITE,&si);
-  if (file==NULL) return false;
-
-  if (desc.outChans>0) {
-    outBufs=new float*[desc.outChans];
-    for (int i=0; i<desc.outChans; i++) {
-      outBufs[i]=new float[desc.bufsize];
-    }
-  }
-
-  response=desc;
-  initialized=true;
-  return true;
-}
diff --git a/src/audio/file.h b/src/audio/file.h
deleted file mode 100644
index c7273d1d..00000000
--- a/src/audio/file.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#include "taAudio.h"
-#include <sndfile.h>
-
-class TAAudioFile: public TAAudio {
-  float** iInBufs;
-  float** iOutBufs;
-
-  SNDFILE* file;
-  SF_INFO si;
-
-  public:
-    void onProcess(unsigned char* buf, int nframes);
-
-    void* getContext();
-    bool quit();
-    bool setRun(bool run);
-    bool init(TAAudioDesc& request, TAAudioDesc& response);
-};
diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index ecc7d597..a697ca59 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -5,7 +5,6 @@
 #ifdef HAVE_JACK
 #include "../audio/jack.h"
 #endif
-#include "../audio/file.h"
 #include "platform/genesis.h"
 #include "platform/genesisext.h"
 #include "platform/sms.h"
@@ -679,10 +678,6 @@ DivWavetable* DivEngine::getWave(int index) {
   return song.wave[index];
 }
 
-void DivEngine::setLoops(int loops) {
-  remainingLoops=loops;
-}
-
 void DivEngine::play() {
   
 }
@@ -708,9 +703,6 @@ bool DivEngine::init() {
     case DIV_AUDIO_SDL:
       output=new TAAudioSDL;
       break;
-    case DIV_AUDIO_FILE:
-      output=new TAAudioFile;
-      break;
     default:
       logE("invalid audio engine!\n");
       return false;
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 858efd98..79f0d948 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -13,8 +13,7 @@ enum DivStatusView {
 
 enum DivAudioEngines {
   DIV_AUDIO_JACK=0,
-  DIV_AUDIO_SDL,
-  DIV_AUDIO_FILE
+  DIV_AUDIO_SDL
 };
 
 struct DivChannelState {
@@ -59,15 +58,12 @@ class DivEngine {
   int chans;
   bool playing;
   bool speedAB;
-  bool endOfSong;
-  int ticks, cycles, curRow, curOrder, remainingLoops;
+  int ticks, cycles, curRow, curOrder;
   int changeOrd, changePos, totalTicks, totalCmds, lastCmds, cmdsPerSecond;
   DivStatusView view;
   DivChannelState chan[17];
   DivAudioEngines audioEngine;
 
-  String outName;
-
   short vibTable[64];
 
   blip_buffer_t* bb[2];
@@ -80,8 +76,7 @@ class DivEngine {
   void processRow(int i, bool afterDelay);
   void nextOrder();
   void nextRow();
-  // returns true if end of song.
-  bool nextTick();
+  void nextTick();
   bool perSystemEffect(int ch, unsigned char effect, unsigned char effectVal);
   bool perSystemPostEffect(int ch, unsigned char effect, unsigned char effectVal);
   void renderSamples();
@@ -99,18 +94,12 @@ class DivEngine {
     // play
     void play();
 
-    // set remaining loops. -1 means loop forever.
-    void setLoops(int loops);
-
     // set the audio system.
     void setAudio(DivAudioEngines which);
 
     // set the view mode.
     void setView(DivStatusView which);
 
-    // open audio output file.
-    bool openAudioOut(String filename);
-
     // initialize the engine.
     bool init();
 
@@ -118,12 +107,10 @@ class DivEngine {
       chans(0),
       playing(false),
       speedAB(false),
-      endOfSong(false),
       ticks(0),
       cycles(0),
       curRow(0),
       curOrder(0),
-      remainingLoops(-1),
       changeOrd(-1),
       changePos(0),
       totalTicks(0),
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index 30445a08..de0bf1d7 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -1,11 +1,9 @@
 #include "dispatch.h"
 #include "engine.h"
-#include "../ta-log.h"
 
 void DivEngine::nextOrder() {
   curRow=0;
   if (++curOrder>=song.ordersLen) {
-    endOfSong=true;
     curOrder=0;
   }
 }
@@ -520,11 +518,9 @@ void DivEngine::nextRow() {
   }
   if (changeOrd>=0) {
     curRow=changePos;
-    if (changeOrd<=curOrder) endOfSong=true;
     curOrder=changeOrd;
     if (curOrder>=song.ordersLen) {
       curOrder=0;
-      endOfSong=true;
     }
     changeOrd=-1;
   }
@@ -547,8 +543,7 @@ void DivEngine::nextRow() {
   }
 }
 
-bool DivEngine::nextTick() {
-  bool ret=false;
+void DivEngine::nextTick() {
   if (song.customTempo) {
     cycles=dispatch->rate/song.hz;
   } else {
@@ -653,10 +648,6 @@ bool DivEngine::nextTick() {
     cmdsPerSecond=totalCmds-lastCmds;
     lastCmds=totalCmds;
   }
-
-  ret=endOfSong;
-  endOfSong=false;
-  return ret;
 }
 
 void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsigned int size) {
@@ -673,26 +664,15 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
   size_t runLeft=runtotal;
   size_t runPos=0;
   while (runLeft) {
-    if (!remainingLoops) {
-      memset(bbIn[0]+runPos,0,runLeft*sizeof(short));
-      memset(bbIn[1]+runPos,0,runLeft*sizeof(short));
-      break;
+    if (runLeft>=cycles) {
+      runLeft-=cycles;
+      dispatch->acquire(bbIn[0],bbIn[1],runPos,cycles);
+      runPos+=cycles;
+      nextTick();
     } else {
-      if (runLeft>=cycles) {
-        runLeft-=cycles;
-        dispatch->acquire(bbIn[0],bbIn[1],runPos,cycles);
-        runPos+=cycles;
-        if (nextTick()) {
-          if (remainingLoops>0) {
-            remainingLoops--;
-            if (!remainingLoops) logI("end of song!\n");
-          }
-        }
-      } else {
-        dispatch->acquire(bbIn[0],bbIn[1],runPos,runLeft);
-        cycles-=runLeft;
-        break;
-      }
+      dispatch->acquire(bbIn[0],bbIn[1],runPos,runLeft);
+      cycles-=runLeft;
+      break;
     }
   }
 
diff --git a/src/main.cpp b/src/main.cpp
index d9fc003d..2076940a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,4 @@
-#include <exception>
 #include <stdio.h>
-#include <string>
 #include "ta-log.h"
 #include "engine/engine.h"
 
@@ -100,26 +98,6 @@ bool pWarranty(String) {
   return false;
 }
 
-bool pLoops(String val) {
-  try {
-    int count=std::stoi(val);
-    if (count<0) {
-      e.setLoops(-1);
-    } else {
-      e.setLoops(count+1);
-    }
-  } catch (std::exception& e) {
-    logE("loop count shall be a number.\n");
-    return false;
-  }
-  return true;
-}
-
-bool pOutput(String val) {
-  e.setAudio(DIV_AUDIO_FILE);
-  return e.openAudioOut(val);
-}
-
 bool needsValue(String param) {
   for (size_t i=0; i<params.size(); i++) {
     if (params[i].name==param) {
@@ -133,12 +111,9 @@ void initParams() {
   params.push_back(TAParam("h","help",false,pHelp,"","display this help"));
 
   params.push_back(TAParam("a","audio",true,pAudio,"jack|sdl","set audio engine (SDL by default)"));
-  params.push_back(TAParam("o","output",true,pOutput,"<filename>","output audio to file"));
   params.push_back(TAParam("L","loglevel",true,pLogLevel,"debug|info|warning|error","set the log level (info by default)"));
   params.push_back(TAParam("v","view",true,pView,"pattern|commands|nothing","set visualization (pattern by default)"));
 
-  params.push_back(TAParam("l","loops",true,pLoops,"<count>","set number of loops (-1 means loop forever)"));
-
   params.push_back(TAParam("V","version",false,pVersion,"","view information about Furnace."));
   params.push_back(TAParam("W","warranty",false,pWarranty,"","view warranty disclaimer."));
 }