diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index a6b7ecfd..3a5b3b7e 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -1413,6 +1413,12 @@ void DivEngine::reset() {
   dispatch->reset();
 }
 
+void DivEngine::syncReset() {
+  isBusy.lock();
+  reset();
+  isBusy.unlock();
+}
+
 String DivEngine::getConfigPath() {
   return configPath;
 }
@@ -1696,6 +1702,7 @@ void DivEngine::initDispatch() {
       break;
   }
   dispatch->init(this,getChannelCount(song.system),got.rate,(!song.pal) || (song.customTempo!=0 && song.hz<53));
+  chans=getChannelCount(song.system);
 
   blip_set_rates(bb[0],dispatch->rate,got.rate);
   blip_set_rates(bb[1],dispatch->rate,got.rate);
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 558313fe..77778aec 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -108,6 +108,7 @@ class DivEngine {
   bool perSystemEffect(int ch, unsigned char effect, unsigned char effectVal);
   bool perSystemPostEffect(int ch, unsigned char effect, unsigned char effectVal);
   void renderSamples();
+  void reset();
 
   public:
     DivSong song;
@@ -146,7 +147,7 @@ class DivEngine {
     void stop();
 
     // reset playback state
-    void reset();
+    void syncReset();
 
     // get config path
     String getConfigPath();
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index f2da7b55..0266e905 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -1768,11 +1768,11 @@ int FurnaceGUI::load(String path) {
     if (!e->load(file,(size_t)len)) {
       logE("could not open file!\n");
       e->initDispatch();
-      e->reset();
+      e->syncReset();
       return 1;
     }
     e->initDispatch();
-    e->reset();
+    e->syncReset();
   }
   updateWindowTitle();
   return 0;
@@ -2058,11 +2058,11 @@ bool FurnaceGUI::init() {
   ImGui::GetIO().ConfigFlags|=ImGuiConfigFlags_DockingEnable;
   ImGui::GetIO().IniFilename=finalLayoutPath;
 
-  if ((mainFont=ImGui::GetIO().Fonts->AddFontFromMemoryCompressedTTF(defFont_main_compressed_data,defFont_main_compressed_size,18*dpiScale))==NULL) {
+  if ((mainFont=ImGui::GetIO().Fonts->AddFontFromMemoryCompressedTTF(defFont_main_compressed_data,defFont_main_compressed_size,e->getConfInt("mainFontSize",18)*dpiScale))==NULL) {
     logE("could not load UI font!\n");
     return false;
   }
-  if ((patFont=ImGui::GetIO().Fonts->AddFontFromMemoryCompressedTTF(defFont_pat_compressed_data,defFont_pat_compressed_size,18*dpiScale))==NULL) {
+  if ((patFont=ImGui::GetIO().Fonts->AddFontFromMemoryCompressedTTF(defFont_pat_compressed_data,defFont_pat_compressed_size,e->getConfInt("patFontSize",18)*dpiScale))==NULL) {
     logE("could not load pattern font!\n");
     return false;
   }