diff --git a/demos/ay8930/AY8930Shuffle.fur b/demos/ay8930/AY8930Shuffle.fur
new file mode 100644
index 000000000..68931cf09
Binary files /dev/null and b/demos/ay8930/AY8930Shuffle.fur differ
diff --git a/demos/sms/FlowOfSN7.fur b/demos/sms/FlowOfSN7.fur
new file mode 100644
index 000000000..643686cc0
Binary files /dev/null and b/demos/sms/FlowOfSN7.fur differ
diff --git a/src/engine/platform/c64.cpp b/src/engine/platform/c64.cpp
index b41a52d5e..5c1521aba 100644
--- a/src/engine/platform/c64.cpp
+++ b/src/engine/platform/c64.cpp
@@ -64,6 +64,41 @@ const char** DivPlatformC64::getRegisterSheet() {
   return regCheatSheetSID;
 }
 
+short DivPlatformC64::runFakeFilter(unsigned char ch, int in) {
+  if (!(regPool[0x17]&(1<<ch))) {
+    if (regPool[0x18]&0x80 && ch==2) return 0;
+    float fin=in;
+    fin*=(float)(regPool[0x18]&15)/20.0f;
+    return CLAMP(fin,-32768,32767);
+  }
+
+  // taken from dSID
+  float fin=in;
+  float fout=0;
+  float ctf=fakeCutTable[((regPool[0x15]&7)|(regPool[0x16]<<3))&0x7ff];
+  float reso=(sidIs6581?
+    ((regPool[0x17]>0x5F)?8.0/(float)(regPool[0x17]>>4):1.41):
+    (pow(2,((float)(4-(float)(regPool[0x17]>>4))/8)))
+  );
+  float tmp=fin+fakeBand[ch]*reso+fakeLow[ch];
+  if (regPool[0x18]&0x40) {
+    fout-=tmp;
+  }
+  tmp=fakeBand[ch]-tmp*ctf;
+  fakeBand[ch]=tmp;
+  if (regPool[0x18]&0x20) {
+    fout-=tmp;
+  }
+  tmp=fakeLow[ch]+tmp*ctf;
+  fakeLow[ch]=tmp;
+  if (regPool[0x18]&0x10) {
+    fout+=tmp;
+  }
+
+  fout*=(float)(regPool[0x18]&15)/20.0f;
+  return CLAMP(fout,-32768,32767);
+}
+
 void DivPlatformC64::acquire(short** buf, size_t len) {
   int dcOff=(sidCore)?0:sid->get_dc(0);
   for (size_t i=0; i<len; i++) {
@@ -92,18 +127,18 @@ void DivPlatformC64::acquire(short** buf, size_t len) {
       sid_fp->clock(4,&buf[0][i]);
       if (++writeOscBuf>=4) {
         writeOscBuf=0;
-        oscBuf[0]->data[oscBuf[0]->needle++]=(sid_fp->lastChanOut[0]-dcOff)>>5;
-        oscBuf[1]->data[oscBuf[1]->needle++]=(sid_fp->lastChanOut[1]-dcOff)>>5;
-        oscBuf[2]->data[oscBuf[2]->needle++]=(sid_fp->lastChanOut[2]-dcOff)>>5;
+        oscBuf[0]->data[oscBuf[0]->needle++]=runFakeFilter(0,(sid_fp->lastChanOut[0]-dcOff)>>5);
+        oscBuf[1]->data[oscBuf[1]->needle++]=runFakeFilter(1,(sid_fp->lastChanOut[1]-dcOff)>>5);
+        oscBuf[2]->data[oscBuf[2]->needle++]=runFakeFilter(2,(sid_fp->lastChanOut[2]-dcOff)>>5);
       }
     } else {
       sid->clock();
       buf[0][i]=sid->output();
       if (++writeOscBuf>=16) {
         writeOscBuf=0;
-        oscBuf[0]->data[oscBuf[0]->needle++]=(sid->last_chan_out[0]-dcOff)>>5;
-        oscBuf[1]->data[oscBuf[1]->needle++]=(sid->last_chan_out[1]-dcOff)>>5;
-        oscBuf[2]->data[oscBuf[2]->needle++]=(sid->last_chan_out[2]-dcOff)>>5;
+        oscBuf[0]->data[oscBuf[0]->needle++]=runFakeFilter(0,(sid->last_chan_out[0]-dcOff)>>5);
+        oscBuf[1]->data[oscBuf[1]->needle++]=runFakeFilter(1,(sid->last_chan_out[1]-dcOff)>>5);
+        oscBuf[2]->data[oscBuf[2]->needle++]=runFakeFilter(2,(sid->last_chan_out[2]-dcOff)>>5);
       }
     }
   }
@@ -540,6 +575,8 @@ void DivPlatformC64::reset() {
   for (int i=0; i<3; i++) {
     chan[i]=DivPlatformC64::Channel();
     chan[i].std.setEngine(parent);
+    fakeLow[i]=0;
+    fakeBand[i]=0;
   }
 
   if (sidCore==2) {
@@ -613,6 +650,24 @@ void DivPlatformC64::setFlags(const DivConfig& flags) {
   keyPriority=flags.getBool("keyPriority",true);
   testAD=((flags.getInt("testAttack",0)&15)<<4)|(flags.getInt("testDecay",0)&15);
   testSR=((flags.getInt("testSustain",0)&15)<<4)|(flags.getInt("testRelease",0)&15);
+
+  // init fake filter table
+  // taken from dSID
+  double cutRatio=-2.0*3.14*(sidIs6581?(((double)oscBuf[0]->rate/44100.0)*(20000.0/256.0)):(12500.0/256.0))/(double)oscBuf[0]->rate;
+
+  for (int i=0; i<2048; i++) {
+    double c=(double)i/8.0+0.2;
+    if (sidIs6581) {
+      if (c<24) {
+        c=2.0*sin(771.78/(double)oscBuf[0]->rate);
+      } else {
+        c=(44100.0/(double)oscBuf[0]->rate)-1.263*(44100.0/(double)oscBuf[0]->rate)*exp(c*cutRatio);
+      }
+    } else {
+      c=1-exp(c*cutRatio);
+    }
+    fakeCutTable[i]=c;
+  }
 }
 
 int DivPlatformC64::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
diff --git a/src/engine/platform/c64.h b/src/engine/platform/c64.h
index 26b39c804..5f67b956a 100644
--- a/src/engine/platform/c64.h
+++ b/src/engine/platform/c64.h
@@ -56,6 +56,9 @@ class DivPlatformC64: public DivDispatch {
   Channel chan[3];
   DivDispatchOscBuffer* oscBuf[3];
   bool isMuted[3];
+  float fakeLow[3];
+  float fakeBand[3];
+  float fakeCutTable[2048];
   struct QueuedWrite {
       unsigned char addr;
       unsigned char val;
@@ -80,6 +83,8 @@ class DivPlatformC64: public DivDispatch {
   friend void putDispatchChip(void*,int);
   friend void putDispatchChan(void*,int,int);
 
+  inline short runFakeFilter(unsigned char ch, int in);
+
   void acquire_classic(short* bufL, short* bufR, size_t start, size_t len);
   void acquire_fp(short* bufL, short* bufR, size_t start, size_t len);
 
diff --git a/src/engine/platform/sound/c64_d/dsid.c b/src/engine/platform/sound/c64_d/dsid.c
index d01dc7ad7..2ff2dacf8 100644
--- a/src/engine/platform/sound/c64_d/dsid.c
+++ b/src/engine/platform/sound/c64_d/dsid.c
@@ -115,11 +115,17 @@ void dSID_init(struct SID_chip* sid, double clockRate, double samplingRate, int
     double prd0 = sid->g.ckr > 9 ? sid->g.ckr : 9;
     sid->g.Aprd[0] = prd0;
     sid->g.Astp[0] = ceil(prd0 / 9);
+
+    for (int i=0; i<3; i++) {
+      sid->fakeplp[i]=0;
+      sid->fakepbp[i]=0;
+    }
 }
 
 double dSID_render(struct SID_chip* sid) {
     double flin = 0, output = 0;
     double wfout = 0;
+    double step = 0;
     for (int chn = 0; chn < 3; chn++) {
         struct SIDVOICE *voic = &((struct SIDMEM *) (sid->M))->v[chn];
         double pgt = (sid->SIDct->ch[chn].Ast & GAT);
@@ -142,7 +148,6 @@ double dSID_render(struct SID_chip* sid) {
         if (sid->SIDct->ch[chn].rcnt >= 0x8000)
             sid->SIDct->ch[chn].rcnt -= 0x8000;
 
-        static double step;
         double prd;
 
         if (sid->SIDct->ch[chn].Ast & ATK) {
@@ -291,8 +296,6 @@ double dSID_render(struct SID_chip* sid) {
                 // mostly copypasted from below
                 double fakeflin = chnout;
                 double fakeflout = 0;
-                static double fakeplp[3] = {0};
-                static double fakepbp[3] = {0};
                 double ctf = sid->g.ctf_table[((sid->M[0x15]&7)|(sid->M[0x16]<<3))&0x7ff];
                 double reso;
                 if (sid->g.model == 8580) {
@@ -300,15 +303,15 @@ double dSID_render(struct SID_chip* sid) {
                 } else {
                     reso = (sid->M[0x17] > 0x5F) ? 8.0 / (double) (sid->M[0x17] >> 4) : 1.41;
                 }
-                double tmp = fakeflin + fakepbp[chn] * reso + fakeplp[chn];
+                double tmp = fakeflin + sid->fakepbp[chn] * reso + sid->fakeplp[chn];
                 if (sid->M[0x18] & HP)
                     fakeflout -= tmp;
-                tmp = fakepbp[chn] - tmp * ctf;
-                fakepbp[chn] = tmp;
+                tmp = sid->fakepbp[chn] - tmp * ctf;
+                sid->fakepbp[chn] = tmp;
                 if (sid->M[0x18] & BP)
                     fakeflout -= tmp;
-                tmp = fakeplp[chn] + tmp * ctf;
-                fakeplp[chn] = tmp;
+                tmp = sid->fakeplp[chn] + tmp * ctf;
+                sid->fakeplp[chn] = tmp;
                 if (sid->M[0x18] & LP)
                     fakeflout += tmp;
 
diff --git a/src/engine/platform/sound/c64_d/dsid.h b/src/engine/platform/sound/c64_d/dsid.h
index b02d1870e..b17a51f55 100644
--- a/src/engine/platform/sound/c64_d/dsid.h
+++ b/src/engine/platform/sound/c64_d/dsid.h
@@ -81,6 +81,8 @@ struct SID_chip {
     uint8_t M[MemLen];
     int16_t lastOut[3];
     int mute_mask;
+    double fakeplp[3];
+    double fakepbp[3];
 };
 
 double dSID_render(struct SID_chip* sid);
diff --git a/src/engine/platform/sound/c64_fp/SID.cpp b/src/engine/platform/sound/c64_fp/SID.cpp
index a996d2230..03c778c90 100644
--- a/src/engine/platform/sound/c64_fp/SID.cpp
+++ b/src/engine/platform/sound/c64_fp/SID.cpp
@@ -351,7 +351,7 @@ void SID::write(int offset, unsigned char value)
         break;
 
     case 0x04: // Voice #1 control register
-        voice[0]->writeCONTROL_REG(muted[0] ? 0 : value);
+        voice[0]->writeCONTROL_REG(value);
         break;
 
     case 0x05: // Voice #1 Attack and Decay length
@@ -379,7 +379,7 @@ void SID::write(int offset, unsigned char value)
         break;
 
     case 0x0b: // Voice #2 control register
-        voice[1]->writeCONTROL_REG(muted[1] ? 0 : value);
+        voice[1]->writeCONTROL_REG(value);
         break;
 
     case 0x0c: // Voice #2 Attack and Decay length
@@ -407,7 +407,7 @@ void SID::write(int offset, unsigned char value)
         break;
 
     case 0x12: // Voice #3 control register
-        voice[2]->writeCONTROL_REG(muted[2] ? 0 : value);
+        voice[2]->writeCONTROL_REG(value);
         break;
 
     case 0x13: // Voice #3 Attack and Decay length
diff --git a/src/engine/platform/sound/c64_fp/SID.h b/src/engine/platform/sound/c64_fp/SID.h
index 85b6a4e4d..77d7706d4 100644
--- a/src/engine/platform/sound/c64_fp/SID.h
+++ b/src/engine/platform/sound/c64_fp/SID.h
@@ -320,11 +320,11 @@ int SID::output()
     const int v2 = voice[1]->output(voice[0]->wave());
     const int v3 = voice[2]->output(voice[1]->wave());
 
-    lastChanOut[0]=v1;
-    lastChanOut[1]=v2;
-    lastChanOut[2]=v3;
+    lastChanOut[0]=muted[0]?0:v1;
+    lastChanOut[1]=muted[1]?0:v2;
+    lastChanOut[2]=muted[2]?0:v3;
 
-    return externalFilter->clock(filter->clock(v1, v2, v3));
+    return externalFilter->clock(filter->clock(muted[0]?0:v1, muted[1]?0:v2, muted[2]?0:v3));
 }
 
 
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 6eefb6913..6437ecab7 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -5252,7 +5252,7 @@ bool FurnaceGUI::loop() {
             quit=true;
           }
           ImGui::SameLine();
-          if (ImGui::Button("Cancel")) {
+          if (ImGui::Button("Cancel") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
             ImGui::CloseCurrentPopup();
           }
           break;
@@ -5276,7 +5276,7 @@ bool FurnaceGUI::loop() {
             displayNew=true;
           }
           ImGui::SameLine();
-          if (ImGui::Button("Cancel")) {
+          if (ImGui::Button("Cancel") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
             ImGui::CloseCurrentPopup();
           }
           break;
@@ -5300,7 +5300,7 @@ bool FurnaceGUI::loop() {
             openFileDialog(GUI_FILE_OPEN);
           }
           ImGui::SameLine();
-          if (ImGui::Button("Cancel")) {
+          if (ImGui::Button("Cancel") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
             ImGui::CloseCurrentPopup();
           }
           break;
@@ -5324,7 +5324,7 @@ bool FurnaceGUI::loop() {
             openFileDialog(GUI_FILE_OPEN_BACKUP);
           }
           ImGui::SameLine();
-          if (ImGui::Button("Cancel")) {
+          if (ImGui::Button("Cancel") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
             ImGui::CloseCurrentPopup();
           }
           break;
@@ -5355,7 +5355,7 @@ bool FurnaceGUI::loop() {
             nextFile="";
           }
           ImGui::SameLine();
-          if (ImGui::Button("Cancel")) {
+          if (ImGui::Button("Cancel") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
             ImGui::CloseCurrentPopup();
             nextFile="";
           }
@@ -5409,7 +5409,7 @@ bool FurnaceGUI::loop() {
             syncSettings();
           }
           ImGui::SameLine();
-          if (ImGui::Button("Cancel")) {
+          if (ImGui::Button("Cancel") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
             ImGui::CloseCurrentPopup();
           }
           break;
@@ -5496,7 +5496,7 @@ bool FurnaceGUI::loop() {
             ImGui::CloseCurrentPopup();
           }
 
-          if (ImGui::Button("Wait! What am I doing? Cancel!")) {
+          if (ImGui::Button("Wait! What am I doing? Cancel!") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
             ImGui::CloseCurrentPopup();
           }
           break;
@@ -5647,7 +5647,7 @@ bool FurnaceGUI::loop() {
         ImGui::EndDisabled();
         ImGui::SameLine();
       }
-      if (ImGui::Button("Cancel")) {
+      if (ImGui::Button("Cancel") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
         for (std::pair<DivInstrument*,bool>& i: pendingIns) {
           i.second=false;
         }
@@ -5719,7 +5719,7 @@ bool FurnaceGUI::loop() {
         ImGui::CloseCurrentPopup();
       }
       ImGui::SameLine();
-      if (ImGui::Button("Cancel")) {
+      if (ImGui::Button("Cancel") || ImGui::IsKeyPressed(ImGuiKey_Escape)) {
         ImGui::CloseCurrentPopup();
       }
       ImGui::EndPopup();
@@ -5849,13 +5849,12 @@ bool FurnaceGUI::loop() {
               if (outFile!=NULL) {
                 if (fwrite(w->getFinalBuf(),1,w->size(),outFile)!=w->size()) {
                   logW("did not write backup entirely: %s!",strerror(errno));
-                  w->finish();
                 }
                 fclose(outFile);
               } else {
                 logW("could not save backup: %s!",strerror(errno));
-                w->finish();
               }
+              w->finish();
 
               // delete previous backup if there are too many
               delFirstBackup(backupBaseName);