diff --git a/higan/emulator/emulator.hpp b/higan/emulator/emulator.hpp
index 2e9adba5e..9c2baa65a 100755
--- a/higan/emulator/emulator.hpp
+++ b/higan/emulator/emulator.hpp
@@ -39,13 +39,13 @@ using namespace nall;
 
 namespace higan {
   static const string Name    = "higan";
-  static const string Version = "106.234";
+  static const string Version = "107";
   static const string Author  = "byuu";
   static const string License = "GPLv3";
   static const string Website = "https://byuu.org";
 
   //incremented only when serialization format changes
-  static const string SerializerVersion = "106.234";
+  static const string SerializerVersion = "107";
 
   namespace Constants {
     namespace Colorburst {
diff --git a/higan/sfc/coprocessor/icd/icd.cpp b/higan/sfc/coprocessor/icd/icd.cpp
index bfb7a3040..4ae40fb19 100755
--- a/higan/sfc/coprocessor/icd/icd.cpp
+++ b/higan/sfc/coprocessor/icd/icd.cpp
@@ -25,15 +25,6 @@ auto ICD::unload() -> void {
 }
 
 auto ICD::main() -> void {
-  #if 0
-  static uint n = 0;
-  float x = sin((2*3.141592*(n++/64)*1000.0)/44100.0)*0.1;
-  GameBoy::apu.stream->sample(x, x);
-  Thread::step(2);
-  Thread::synchronize(cpu);
-  return;
-  #endif
-
   if(r6003.bit(7)) {
     GameBoy::system.run();
     Thread::step(GameBoy::system.clocksExecuted());
diff --git a/higan/target-higan/higan.cpp b/higan/target-higan/higan.cpp
index 60d3d3189..26359a6c0 100644
--- a/higan/target-higan/higan.cpp
+++ b/higan/target-higan/higan.cpp
@@ -151,6 +151,25 @@ auto nall::main(Arguments arguments) -> void {
   emulator.inputUpdate();
   inputManager.poll();
   hotkeys.bind();
+
+  if(settings.prototypeWarning) {
+    MessageDialog dialog;
+    dialog.setTitle({"higan v", higan::Version, " (feedback prototype)"});
+    dialog.setText(
+      "Note: this is a prototype release meant for feedback; not general use.\n"
+      "Compared to higan v106, a new tree-based user interface has been designed.\n"
+      "Please go to 'Help -> User Guide' for an overview on how to use this program.\n\n"
+      "As this is exerpimental, the next release will likely be quite different as well.\n"
+      "If you're not interested in this experiment, please continue using v106 for now.\n"
+      "Otherwise, I would appreciate any feedback on how to improve higan's usability.\n"
+      "Please go to 'Help -> Feedback' for ways to send me feedback.\n\n"
+      "Thank you!"
+    );
+    dialog.setOption("Don't show this message again");
+    dialog.information();
+    if(dialog.checked()) settings.prototypeWarning = false;
+  }
+
   Application::onMain({&Emulator::main, &emulator});
   Application::run();
 
diff --git a/higan/target-higan/menus/help.cpp b/higan/target-higan/menus/help.cpp
index 6883c4ce2..da6347f5a 100644
--- a/higan/target-higan/menus/help.cpp
+++ b/higan/target-higan/menus/help.cpp
@@ -6,6 +6,9 @@ HelpMenu::HelpMenu(MenuBar* parent) : Menu(parent) {
   userGuide.setIcon(Icon::Application::Browser).setText("User Guide ...").onActivate([&] {
     invoke("https://byuu.org/higan/user-guide");
   });
+  feedback.setIcon(Icon::Application::Browser).setText("Feedback ...").onActivate([&] {
+    invoke("https://byuu.org/higan/feedback");
+  });
   about.setIcon(Icon::Prompt::Question).setText("About ...").onActivate([&] {
     AboutDialog()
     .setLogo(Resource::Logo)
diff --git a/higan/target-higan/menus/menus.hpp b/higan/target-higan/menus/menus.hpp
index 866388bd0..5ecd4b8fc 100644
--- a/higan/target-higan/menus/menus.hpp
+++ b/higan/target-higan/menus/menus.hpp
@@ -61,6 +61,7 @@ struct HelpMenu : Menu {
   HelpMenu(MenuBar*);
   MenuItem webpage{this};
   MenuItem userGuide{this};
+  MenuItem feedback{this};
   MenuSeparator separator{this};
   MenuItem about{this};
 };
diff --git a/higan/target-higan/program/system-overview.cpp b/higan/target-higan/program/system-overview.cpp
index 10f036653..b804bde5f 100644
--- a/higan/target-higan/program/system-overview.cpp
+++ b/higan/target-higan/program/system-overview.cpp
@@ -1,6 +1,6 @@
 SystemOverview::SystemOverview(View* parent) : PanelItem(parent, Size{~0, ~0}) {
   setCollapsible().setVisible(false);
-  header.setText("Overview").setFont(Font().setBold());
+  header.setText("Preview (read-only)").setFont(Font().setBold());
 }
 
 auto SystemOverview::show() -> void {
diff --git a/higan/target-higan/settings/settings.cpp b/higan/target-higan/settings/settings.cpp
index 9d225d577..464378cf9 100644
--- a/higan/target-higan/settings/settings.cpp
+++ b/higan/target-higan/settings/settings.cpp
@@ -16,8 +16,13 @@ auto Settings::save() -> void {
 
 auto Settings::properties(bool mode, Markup::Node document) -> void {
   #define s(name) \
-    if(mode == 0) document[string{#name}.trimRight(".identifier", 1L).transform(".", "/")].value(name); \
-    if(mode == 1) document(string{#name}.trimRight(".identifier", 1L).transform(".", "/")).setValue(name);
+    if(mode == 0 && document[string{#name}.trimRight(".identifier", 1L).transform(".", "/")]) { \
+      document[string{#name}.trimRight(".identifier", 1L).transform(".", "/")].value(name); \
+    } \
+    if(mode == 1) { \
+      document(string{#name}.trimRight(".identifier", 1L).transform(".", "/")).setValue(name); \
+    }
+  s(prototypeWarning)
   s(video.driver)
   s(video.monitor)
   s(video.format)
diff --git a/higan/target-higan/settings/settings.hpp b/higan/target-higan/settings/settings.hpp
index c2d6de10f..3cf0adecc 100644
--- a/higan/target-higan/settings/settings.hpp
+++ b/higan/target-higan/settings/settings.hpp
@@ -3,6 +3,8 @@ struct Settings {
   auto save() -> void;
   auto properties(bool mode, Markup::Node document) -> void;
 
+  bool prototypeWarning = true;
+
   struct {
     string driver = Video::safestDriver();
     string monitor = "Primary";
diff --git a/icarus/icarus.hpp b/icarus/icarus.hpp
index 5f8ff8be4..4ed483837 100644
--- a/icarus/icarus.hpp
+++ b/icarus/icarus.hpp
@@ -6,7 +6,7 @@ using namespace hiro;
 
 namespace icarus {
   static const string Name    = "icarus";
-  static const string Version = "106.234";
+  static const string Version = "107";
   static const string Author  = "byuu";
   static const string License = "GPLv3";
   static const string Website = "https://byuu.org";
diff --git a/ruby/GNUmakefile b/ruby/GNUmakefile
index 1450daf55..ceb6d5e63 100755
--- a/ruby/GNUmakefile
+++ b/ruby/GNUmakefile
@@ -13,7 +13,7 @@ ifeq ($(ruby),)
     ruby += input.sdl input.xlib input.udev
   else ifeq ($(platform),bsd)
     ruby += video.glx video.glx2 video.xvideo video.xshm
-    ruby += audio.oss #audio.pulseaudio
+    ruby += audio.oss audio.openal #audio.pulseaudio
     ruby += input.sdl input.xlib
   endif
 endif
@@ -65,7 +65,8 @@ endif
 
 ifeq ($(platform),bsd)
   ruby.options += -lX11 -lXext -lXrandr
-  ruby.options += $(if $(findstring audio.openal,$(ruby)),-lopenal)
+  ruby.options += $(if $(findstring audio.openal,$(ruby)),-lopenal -fuse-ld=bfd)
+  # -fuse-ld=bfd: see FreeBSD bug 219089
 endif
 
 ruby.objects := $(object.path)/ruby.o