diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6242bc720..aaef6aead 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,12 +22,12 @@ if (WIN32)
   add_subdirectory(extern/zlib)
   set(HAVE_SDL2 SDL2-static)
   set(HAVE_Z zlibstatic)
-  include_directories(extern/imgui extern/imgui/backends extern/zlib ${CMAKE_CURRENT_BINARY_DIR}/extern/zlib extern/fmt/include)
+  include_directories(extern/imgui extern/imgui/backends extern/igfd  extern/zlib ${CMAKE_CURRENT_BINARY_DIR}/extern/zlib extern/fmt/include)
 else()
   if (BUILD_GUI)
     set(SDL_SHARED ON)
     add_subdirectory(extern/SDL)
-    include_directories(extern/SDL/include extern/imgui extern/imgui/backends extern/fmt/include)
+    include_directories(extern/SDL/include extern/imgui extern/imgui/backends extern/igfd extern/fmt/include)
     if (APPLE)
       set(HAVE_SDL2 SDL2-static)
     else()
diff --git a/src/engine/dispatch.h b/src/engine/dispatch.h
index 82ae4f710..b9d3a6080 100644
--- a/src/engine/dispatch.h
+++ b/src/engine/dispatch.h
@@ -117,5 +117,12 @@ class DivDispatch {
      * @return the number of channels allocated.
      */
     virtual int init(DivEngine* parent, int channels, int sugRate, bool pal);
+
+    /**
+     * quit the DivDispatch.
+     */
+     virtual void quit();
+
+     virtual ~DivDispatch();
 };
 #endif
diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index d7d316ead..61f3e98f7 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -1023,7 +1023,7 @@ void DivEngine::renderSamples() {
 
     // step 1: render to PCM
     unsigned int k=0;
-    float mult=(float)(s->vol+100)/150.0f;
+    float mult=(float)(s->vol)/50.0f;
     for (double j=0; j<s->length; j+=samplePitches[s->pitch]) {
       if (k>=s->rendLength) {
         break;
@@ -1257,6 +1257,27 @@ void DivEngine::initDispatch() {
 
 void DivEngine::quitDispatch() {
   if (dispatch==NULL) return;
+  isBusy.lock();
+  dispatch->quit();
+  delete dispatch;
+  dispatch=NULL;
+  chans=0;
+  playing=false;
+  speedAB=false;
+  endOfSong=false;
+  ticks=0;
+  cycles=0;
+  curRow=0;
+  curOrder=0;
+  nextSpeed=3;
+  clockDrift=0;
+  changeOrd=-1;
+  changePos=0;
+  totalTicks=0;
+  totalCmds=0;
+  lastCmds=0;
+  cmdsPerSecond=0;
+  isBusy.unlock();
 }
 
 bool DivEngine::init(String outName) {
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 0c3bc98fd..038338d09 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -90,7 +90,6 @@ class DivEngine {
   void processRow(int i, bool afterDelay);
   void nextOrder();
   void nextRow();
-  void reset();
   // returns true if end of song.
   bool nextTick();
   bool perSystemEffect(int ch, unsigned char effect, unsigned char effectVal);
@@ -113,6 +112,9 @@ class DivEngine {
     // stop
     void stop();
 
+    // reset playback state
+    void reset();
+
     // get sys channel count
     int getChannelCount(DivSystem sys);
 
diff --git a/src/engine/platform/abstract.cpp b/src/engine/platform/abstract.cpp
index 65582a9b5..7c83f9397 100644
--- a/src/engine/platform/abstract.cpp
+++ b/src/engine/platform/abstract.cpp
@@ -24,3 +24,9 @@ bool DivDispatch::keyOffAffectsArp(int ch) {
 int DivDispatch::init(DivEngine* p, int channels, int sugRate, bool pal) {
   return 0;
 }
+
+void DivDispatch::quit() {
+}
+
+DivDispatch::~DivDispatch() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/arcade.cpp b/src/engine/platform/arcade.cpp
index b4e00f297..c4f71143f 100644
--- a/src/engine/platform/arcade.cpp
+++ b/src/engine/platform/arcade.cpp
@@ -377,3 +377,9 @@ int DivPlatformArcade::init(DivEngine* p, int channels, int sugRate, bool pal) {
 
   return 13;
 }
+
+void DivPlatformArcade::quit() {
+}
+
+DivPlatformArcade::~DivPlatformArcade() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/arcade.h b/src/engine/platform/arcade.h
index 49223e1ac..02db9d2c6 100644
--- a/src/engine/platform/arcade.h
+++ b/src/engine/platform/arcade.h
@@ -53,5 +53,7 @@ class DivPlatformArcade: public DivDispatch {
     void tick();
     bool isStereo();
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformArcade();
 };
 #endif
diff --git a/src/engine/platform/c64.cpp b/src/engine/platform/c64.cpp
index 0277d0068..48a0fce9d 100644
--- a/src/engine/platform/c64.cpp
+++ b/src/engine/platform/c64.cpp
@@ -314,3 +314,9 @@ int DivPlatformC64::init(DivEngine* p, int channels, int sugRate, bool pal) {
 
   return 3;
 }
+
+void DivPlatformC64::quit() {
+}
+
+DivPlatformC64::~DivPlatformC64() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/c64.h b/src/engine/platform/c64.h
index 71d77c724..05930a958 100644
--- a/src/engine/platform/c64.h
+++ b/src/engine/platform/c64.h
@@ -59,6 +59,8 @@ class DivPlatformC64: public DivDispatch {
     void tick();
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
     void setChipModel(bool is6581);
+    void quit();
+    ~DivPlatformC64();
 };
 
 #endif
diff --git a/src/engine/platform/dummy.cpp b/src/engine/platform/dummy.cpp
index ca5b3f5ac..57890996f 100644
--- a/src/engine/platform/dummy.cpp
+++ b/src/engine/platform/dummy.cpp
@@ -75,3 +75,9 @@ int DivPlatformDummy::init(DivEngine* p, int channels, int sugRate, bool pal) {
   reset();
   return channels;
 }
+
+void DivPlatformDummy::quit() {
+}
+
+DivPlatformDummy::~DivPlatformDummy() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/dummy.h b/src/engine/platform/dummy.h
index b118e5078..3601b933e 100644
--- a/src/engine/platform/dummy.h
+++ b/src/engine/platform/dummy.h
@@ -20,4 +20,6 @@ class DivPlatformDummy: public DivDispatch {
     void reset();
     void tick();
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformDummy();
 };
diff --git a/src/engine/platform/gb.cpp b/src/engine/platform/gb.cpp
index ce6e8e28c..7451dffd3 100644
--- a/src/engine/platform/gb.cpp
+++ b/src/engine/platform/gb.cpp
@@ -295,3 +295,10 @@ int DivPlatformGB::init(DivEngine* p, int channels, int sugRate, bool pal) {
   reset();
   return 4;
 }
+
+void DivPlatformGB::quit() {
+  delete gb;
+}
+
+DivPlatformGB::~DivPlatformGB() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/gb.h b/src/engine/platform/gb.h
index a1ed47638..b2cbe3b41 100644
--- a/src/engine/platform/gb.h
+++ b/src/engine/platform/gb.h
@@ -42,6 +42,8 @@ class DivPlatformGB: public DivDispatch {
     void tick();
     bool isStereo();
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformGB();
 };
 
 #endif
diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index 300a26549..75165b3aa 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -413,3 +413,10 @@ int DivPlatformGenesis::init(DivEngine* p, int channels, int sugRate, bool pal)
   reset();
   return 10;
 }
+
+void DivPlatformGenesis::quit() {
+  psg.quit();
+}
+
+DivPlatformGenesis::~DivPlatformGenesis() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/genesis.h b/src/engine/platform/genesis.h
index 3640bdc21..ba57dbc65 100644
--- a/src/engine/platform/genesis.h
+++ b/src/engine/platform/genesis.h
@@ -56,5 +56,7 @@ class DivPlatformGenesis: public DivDispatch {
     bool isStereo();
     bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformGenesis();
 };
 #endif
diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index 5d9e94c00..7f54f6146 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -277,3 +277,10 @@ int DivPlatformGenesisExt::init(DivEngine* parent, int channels, int sugRate, bo
   reset();
   return 13;
 }
+
+void DivPlatformGenesisExt::quit() {
+  DivPlatformGenesis::quit();
+}
+
+DivPlatformGenesisExt::~DivPlatformGenesisExt() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/genesisext.h b/src/engine/platform/genesisext.h
index d9c251841..c68ed1928 100644
--- a/src/engine/platform/genesisext.h
+++ b/src/engine/platform/genesisext.h
@@ -20,4 +20,6 @@ class DivPlatformGenesisExt: public DivPlatformGenesis {
     void tick();
     bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformGenesisExt();
 };
diff --git a/src/engine/platform/nes.cpp b/src/engine/platform/nes.cpp
index d577f3482..6b99d3e09 100644
--- a/src/engine/platform/nes.cpp
+++ b/src/engine/platform/nes.cpp
@@ -310,3 +310,9 @@ int DivPlatformNES::init(DivEngine* p, int channels, int sugRate, bool pal) {
   reset();
   return 5;
 }
+
+void DivPlatformNES::quit() {
+}
+
+DivPlatformNES::~DivPlatformNES() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/nes.h b/src/engine/platform/nes.h
index 164042b54..29826ef1d 100644
--- a/src/engine/platform/nes.h
+++ b/src/engine/platform/nes.h
@@ -48,6 +48,8 @@ class DivPlatformNES: public DivDispatch {
     void tick();
     bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformNES();
 };
 
 #endif
diff --git a/src/engine/platform/pce.cpp b/src/engine/platform/pce.cpp
index f2d9f29be..4a4c5f801 100644
--- a/src/engine/platform/pce.cpp
+++ b/src/engine/platform/pce.cpp
@@ -304,3 +304,10 @@ int DivPlatformPCE::init(DivEngine* p, int channels, int sugRate, bool pal) {
   reset();
   return 6;
 }
+
+void DivPlatformPCE::quit() {
+  delete pce;
+}
+
+DivPlatformPCE::~DivPlatformPCE() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/pce.h b/src/engine/platform/pce.h
index f9d625e4d..cb38b4e62 100644
--- a/src/engine/platform/pce.h
+++ b/src/engine/platform/pce.h
@@ -60,6 +60,8 @@ class DivPlatformPCE: public DivDispatch {
     bool isStereo();
     bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformPCE();
 };
 
 #endif
diff --git a/src/engine/platform/sms.cpp b/src/engine/platform/sms.cpp
index 241664e9d..484b0a0d3 100644
--- a/src/engine/platform/sms.cpp
+++ b/src/engine/platform/sms.cpp
@@ -183,3 +183,10 @@ int DivPlatformSMS::init(DivEngine* p, int channels, int sugRate, bool pal) {
   reset();
   return 4;
 }
+
+void DivPlatformSMS::quit() {
+  delete sn;
+}
+
+DivPlatformSMS::~DivPlatformSMS() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/sms.h b/src/engine/platform/sms.h
index ce0482fb9..e3a55920b 100644
--- a/src/engine/platform/sms.h
+++ b/src/engine/platform/sms.h
@@ -38,6 +38,8 @@ class DivPlatformSMS: public DivDispatch {
     void tick();
     bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformSMS();
 };
 
 #endif
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index ea3382d46..a5bb5af1d 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -529,3 +529,10 @@ int DivPlatformYM2610::init(DivEngine* p, int channels, int sugRate, bool pal) {
   reset();
   return 10;
 }
+
+void DivPlatformYM2610::quit() {
+  delete fm;
+}
+
+DivPlatformYM2610::~DivPlatformYM2610() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/ym2610.h b/src/engine/platform/ym2610.h
index bfef2aa11..713e9a172 100644
--- a/src/engine/platform/ym2610.h
+++ b/src/engine/platform/ym2610.h
@@ -66,5 +66,7 @@ class DivPlatformYM2610: public DivDispatch {
     bool isStereo();
     bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformYM2610();
 };
 #endif
diff --git a/src/engine/platform/ym2610ext.cpp b/src/engine/platform/ym2610ext.cpp
index 772e4cc98..b123520b4 100644
--- a/src/engine/platform/ym2610ext.cpp
+++ b/src/engine/platform/ym2610ext.cpp
@@ -256,3 +256,10 @@ int DivPlatformYM2610Ext::init(DivEngine* parent, int channels, int sugRate, boo
   reset();
   return 16;
 }
+
+void DivPlatformYM2610Ext::quit() {
+  DivPlatformYM2610::quit();
+}
+
+DivPlatformYM2610Ext::~DivPlatformYM2610Ext() {
+}
\ No newline at end of file
diff --git a/src/engine/platform/ym2610ext.h b/src/engine/platform/ym2610ext.h
index 98fe152a9..dd8942d7f 100644
--- a/src/engine/platform/ym2610ext.h
+++ b/src/engine/platform/ym2610ext.h
@@ -20,4 +20,6 @@ class DivPlatformYM2610Ext: public DivPlatformYM2610 {
     void tick();
     bool keyOffAffectsArp(int ch);
     int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+    ~DivPlatformYM2610Ext();
 };
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index db0eb3aa0..0ee565563 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -778,7 +778,7 @@ bool DivEngine::nextTick() {
 }
 
 void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsigned int size) {
-  if (!playing) {
+  if (!playing || dispatch==NULL) {
     memset(out[0],0,size*sizeof(float));
     memset(out[1],0,size*sizeof(float));
     return;
@@ -821,7 +821,6 @@ 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++) {
@@ -844,7 +843,10 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
     blip_read_samples(bb[1],bbOut[1],size,0);
   }
 
-  if (out==NULL) return;
+  if (out==NULL) {
+    isBusy.unlock();
+    return;
+  }
 
   if (dispatch->isStereo()) {
     for (size_t i=0; i<size; i++) {
@@ -857,4 +859,5 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
       out[1][i]=(float)bbOut[0][i]/16384.0;
     }
   }
+  isBusy.unlock();
 }
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 1e6cd67ce..266f75425 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -1,16 +1,23 @@
 #include "gui.h"
 #include "SDL_events.h"
+#include "SDL_keycode.h"
 #include "SDL_render.h"
 #include "SDL_video.h"
 #include "fonts.h"
 #include "../ta-log.h"
 #include "imgui.h"
 #include "imgui_internal.h"
+#include "ImGuiFileDialog.h"
 #include "misc/cpp/imgui_stdlib.h"
-#include <cstdio>
 #include <fmt/printf.h>
 #include <stdexcept>
 
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <unistd.h>
+#endif
+
 const int _ZERO=0;
 const int _ONE=1;
 const int _THREE=3;
@@ -601,6 +608,7 @@ void FurnaceGUI::drawPattern() {
           } else {
             int volColor=(pat->data[i][3]*127)/chanVolMax;
             if (volColor>127) volColor=127;
+            if (volColor<0) volColor=0;
             sprintf(id,"%.2X##PV_%d_%d",pat->data[i][3],i,j);
             ImGui::PushStyleColor(ImGuiCol_Text,volColors[volColor]);
           }
@@ -672,12 +680,7 @@ void FurnaceGUI::drawPattern() {
     ImGui::PopStyleVar();
     ImGui::PopFont();
   }
-  if (ImGui::IsWindowFocused()) {
-    curWindow=GUI_WINDOW_PATTERN;
-  } else {
-    // TODO: what?!
-    curWindow=GUI_WINDOW_PATTERN;
-  }
+  if (ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows)) curWindow=GUI_WINDOW_PATTERN;
   ImGui::End();
 }
 
@@ -721,36 +724,140 @@ void FurnaceGUI::finishSelection() {
   selecting=false;
 }
 
+void FurnaceGUI::moveCursor(int x, int y) {
+  finishSelection();
+  if (x!=0) {
+    if (x>0) {
+      for (int i=0; i<x; i++) {
+        if (++selStart.xFine>=3+e->song.pat[selStart.xCoarse].effectRows*2) {
+          selStart.xFine=0;
+          if (++selStart.xCoarse>=e->getChannelCount(e->song.system)) {
+            selStart.xCoarse=e->getChannelCount(e->song.system)-1;
+            selStart.xFine=2+e->song.pat[selStart.xCoarse].effectRows*2;
+          }
+        }
+      }
+    } else {
+      for (int i=0; i<-x; i++) {
+        if (--selStart.xFine<0) {
+          if (--selStart.xCoarse<0) {
+            selStart.xCoarse=0;
+            selStart.xFine=0;
+          } else {
+            selStart.xFine=2+e->song.pat[selStart.xCoarse].effectRows*2;
+          }
+        }
+      }
+    }
+  }
+  if (y!=0) {
+    selStart.y+=y;
+    if (selStart.y<0) selStart.y=0;
+    if (selStart.y>=e->song.patLen) selStart.y=e->song.patLen-1;
+  }
+  selEnd=selStart;
+  updateScroll(selStart.y);
+}
+
 void FurnaceGUI::editAdvance() {
+  finishSelection();
   selStart.y+=editStep;
   if (selStart.y>=e->song.patLen) selStart.y=e->song.patLen-1;
   selEnd=selStart;
+  updateScroll(selStart.y);
+}
+
+void FurnaceGUI::doDelete() {
+  finishSelection();
+
+  int iCoarse=selStart.xCoarse;
+  int iFine=selStart.xFine;
+  int ord=e->getOrder();
+  for (; iCoarse<=selEnd.xCoarse; iCoarse++) {
+    DivPattern* pat=e->song.pat[iCoarse].getPattern(e->song.orders.ord[iCoarse][ord],true);
+    for (; iFine<3+e->song.pat[iCoarse].effectRows*2 && (iCoarse<selEnd.xCoarse || iFine<=selEnd.xFine); iFine++) {
+      for (int j=selStart.y; j<=selEnd.y; j++) {
+        //printf("deleting from: %d, %d, %d\n",iCoarse,iFine,j);
+        if (iFine==0) {
+          pat->data[j][iFine]=0;
+        }
+        pat->data[j][iFine+1]=(iFine<1)?0:-1;
+      }
+    }
+    iFine=0;
+  }
 }
 
 void FurnaceGUI::keyDown(SDL_Event& ev) {
-  printf("CUR WINDOW: %d\n",curWindow);
   switch (curWindow) {
     case GUI_WINDOW_PATTERN: {
-      if (selStart.xFine==0) { // note
-        try {
-          int num=12*curOctave+noteKeys.at(ev.key.keysym.sym);
-          DivPattern* pat=e->song.pat[selStart.xCoarse].getPattern(e->song.orders.ord[selStart.xCoarse][e->getOrder()],true);
+      switch (ev.key.keysym.sym) {
+        case SDLK_UP:
+          moveCursor(0,-1);
+          break;
+        case SDLK_DOWN:
+          moveCursor(0,1);
+          break;
+        case SDLK_LEFT:
+          moveCursor(-1,0);
+          break;
+        case SDLK_RIGHT:
+          moveCursor(1,0);
+          break;
+        case SDLK_PAGEUP:
+          moveCursor(0,-16);
+          break;
+        case SDLK_PAGEDOWN:
+          moveCursor(0,16);
+          break;
+        case SDLK_DELETE:
+          doDelete();
+          break;
+        default:
+          if (selStart.xFine==0) { // note
+            try {
+              int num=12*curOctave+noteKeys.at(ev.key.keysym.sym);
+              DivPattern* pat=e->song.pat[selStart.xCoarse].getPattern(e->song.orders.ord[selStart.xCoarse][e->getOrder()],true);
 
-          pat->data[selStart.y][0]=num%12;
-          pat->data[selStart.y][1]=num/12;
-          editAdvance();
-        } catch (std::out_of_range& e) {
-        }
-      } else { // value
-        try {
-          int num=valueKeys.at(ev.key.keysym.sym);
-          DivPattern* pat=e->song.pat[selStart.xCoarse].getPattern(e->song.orders.ord[selStart.xCoarse][e->getOrder()],true);
-          if (pat->data[selStart.y][selStart.xFine+1]==-1) pat->data[selStart.y][selStart.xFine+1]=0;
-          pat->data[selStart.y][selStart.xFine+1]=((pat->data[selStart.y][selStart.xFine+1]<<4)|num)&0xff;
-          curNibble=!curNibble;
-          if (!curNibble) editAdvance();
-        } catch (std::out_of_range& e) {
-        }
+              pat->data[selStart.y][0]=num%12;
+              pat->data[selStart.y][1]=num/12;
+              editAdvance();
+            } catch (std::out_of_range& e) {
+            }
+          } else { // value
+            try {
+              int num=valueKeys.at(ev.key.keysym.sym);
+              DivPattern* pat=e->song.pat[selStart.xCoarse].getPattern(e->song.orders.ord[selStart.xCoarse][e->getOrder()],true);
+              if (pat->data[selStart.y][selStart.xFine+1]==-1) pat->data[selStart.y][selStart.xFine+1]=0;
+              pat->data[selStart.y][selStart.xFine+1]=((pat->data[selStart.y][selStart.xFine+1]<<4)|num)&0xff;
+              if (selStart.xFine==1) { // instrument
+                if (pat->data[selStart.y][selStart.xFine+1]>=(int)e->song.ins.size()) {
+                  pat->data[selStart.y][selStart.xFine+1]=(int)e->song.ins.size()-1;
+                }
+                if (e->song.ins.size()<16) {
+                  curNibble=false;
+                  editAdvance();
+                } else {
+                  curNibble=!curNibble;
+                  if (!curNibble) editAdvance();
+                }
+              } else if (selStart.xFine==2) { // volume
+                pat->data[selStart.y][selStart.xFine+1]&=e->getMaxVolumeChan(selStart.xCoarse);
+                if (e->getMaxVolumeChan(selStart.xCoarse)<16) {
+                  curNibble=false;
+                  editAdvance();
+                } else {
+                  curNibble=!curNibble;
+                  if (!curNibble) editAdvance();
+                }
+              } else {
+                curNibble=!curNibble;
+                if (!curNibble) editAdvance();
+              }
+            } catch (std::out_of_range& e) {
+            }
+          }
+          break;
       }
       break;
     }
@@ -763,6 +870,57 @@ void FurnaceGUI::keyUp(SDL_Event& ev) {
   
 }
 
+int FurnaceGUI::load(String path) {
+  if (!path.empty()) {
+    logI("loading module...\n");
+    FILE* f=fopen(path.c_str(),"rb");
+    if (f==NULL) {
+      perror("error");
+      return 1;
+    }
+    if (fseek(f,0,SEEK_END)<0) {
+      perror("size error");
+      fclose(f);
+      return 1;
+    }
+    ssize_t len=ftell(f);
+    if (len==0x7fffffffffffffff) {
+      perror("could not get file length");
+      fclose(f);
+      return 1;
+    }
+    if (len<1) {
+      if (len==0) {
+        printf("that file is empty!\n");
+      } else {
+        perror("tell error");
+      }
+      fclose(f);
+      return 1;
+    }
+    unsigned char* file=new unsigned char[len];
+    if (fseek(f,0,SEEK_SET)<0) {
+      perror("size error");
+      fclose(f);
+      return 1;
+    }
+    if (fread(file,1,(size_t)len,f)!=(size_t)len) {
+      perror("read error");
+      fclose(f);
+      return 1;
+    }
+    fclose(f);
+    e->quitDispatch();
+    if (!e->load((void*)file,(size_t)len)) {
+      logE("could not open file!\n");
+      return 1;
+    }
+    e->initDispatch();
+    e->reset();
+  }
+  return 0;
+}
+
 bool FurnaceGUI::loop() {
   while (!quit) {
     SDL_Event ev;
@@ -829,7 +987,9 @@ bool FurnaceGUI::loop() {
     ImGui::BeginMainMenuBar();
     if (ImGui::BeginMenu("file")) {
       ImGui::MenuItem("new");
-      ImGui::MenuItem("open...");
+      if (ImGui::MenuItem("open...")) {
+        ImGuiFileDialog::Instance()->OpenDialog("FileDialog","Open File","DefleMask module{.dmf},.*",workingDir);
+      }
       ImGui::Separator();
       ImGui::MenuItem("save");
       ImGui::MenuItem("save as...");
@@ -857,6 +1017,34 @@ bool FurnaceGUI::loop() {
     drawInsEdit();
     drawPattern();
 
+    if (ImGuiFileDialog::Instance()->Display("FileDialog")) {
+      if (ImGuiFileDialog::Instance()->IsOk()) {
+        fileName=ImGuiFileDialog::Instance()->GetFilePathName();
+        if (fileName!="") {
+          if (isSaving) {
+            if (fileName.size()<4 || fileName.rfind(".dmf")!=fileName.size()-4) {
+              fileName+=".dmf";
+            }
+          }
+          String copyOfName=fileName;
+          if (isSaving) {
+            printf("saving: %s\n",copyOfName.c_str());
+            //SaveFile(copyOfName.c_str());
+            isSaving=false;
+          } else {
+            load(copyOfName);
+          }
+        }
+      }
+      workingDir=ImGuiFileDialog::Instance()->GetCurrentPath();
+#ifdef _WIN32
+      workingDir+='\\';
+#else
+      workingDir+='/';
+#endif
+      ImGuiFileDialog::Instance()->Close();
+    }
+
     SDL_SetRenderDrawColor(sdlRend,uiColors[GUI_COLOR_BACKGROUND].x*255,
                                    uiColors[GUI_COLOR_BACKGROUND].y*255,
                                    uiColors[GUI_COLOR_BACKGROUND].z*255,
@@ -872,6 +1060,17 @@ bool FurnaceGUI::loop() {
 bool FurnaceGUI::init() {
   float dpiScaleF;
 
+  char tempDir[4096];
+#ifdef _WIN32
+  GetCurrentDirectory(4095,tempDir);
+  workingDir=tempDir;
+  workingDir+='\\';
+#else
+  getcwd(tempDir,4095);
+  workingDir=tempDir;
+  workingDir+='/';
+#endif
+
   sdlWin=SDL_CreateWindow("Furnace",SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,scrW*dpiScale,scrH*dpiScale,SDL_WINDOW_RESIZABLE|SDL_WINDOW_ALLOW_HIGHDPI);
   if (sdlWin==NULL) {
     logE("could not open window!\n");
@@ -918,6 +1117,7 @@ bool FurnaceGUI::init() {
 FurnaceGUI::FurnaceGUI():
   e(NULL),
   quit(false),
+  isSaving(false),
   scrW(1280),
   scrH(800),
   dpiScale(1),
@@ -964,7 +1164,7 @@ FurnaceGUI::FurnaceGUI():
   uiColors[GUI_COLOR_PATTERN_EFFECT_SYS_SECONDARY]=ImVec4(0.0f,1.0f,0.5f,1.0f);
   uiColors[GUI_COLOR_PATTERN_EFFECT_MISC]=ImVec4(0.3f,0.3f,1.0f,1.0f);
 
-  for (int i=0; i<63; i++) {
+  for (int i=0; i<64; i++) {
     ImVec4 col1=uiColors[GUI_COLOR_PATTERN_VOLUME_MIN];
     ImVec4 col2=uiColors[GUI_COLOR_PATTERN_VOLUME_HALF];
     ImVec4 col3=uiColors[GUI_COLOR_PATTERN_VOLUME_MAX];
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 3bb50a4c5..17d38058d 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -55,7 +55,9 @@ class FurnaceGUI {
   SDL_Window* sdlWin;
   SDL_Renderer* sdlRend;
 
-  bool quit;
+  String workingDir, fileName;
+
+  bool quit, isSaving;
 
   int scrW, scrH;
 
@@ -102,11 +104,15 @@ class FurnaceGUI {
   void updateSelection(int xCoarse, int xFine, int y);
   void finishSelection();
 
+  void moveCursor(int x, int y);
   void editAdvance();
+  void doDelete();
 
   void keyDown(SDL_Event& ev);
   void keyUp(SDL_Event& ev);
 
+  int load(String path);
+
   public:
     const char* noteName(short note, short octave);
     void bindEngine(DivEngine* eng);