diff --git a/source/application.cpp b/source/application.cpp
index 72d0415..5940724 100644
--- a/source/application.cpp
+++ b/source/application.cpp
@@ -17,6 +17,18 @@
 
 #include <psemek/log/log.hpp>
 
+#include <psemek/audio/engine.hpp>
+#include <psemek/audio/combine/mixer.hpp>
+#include <psemek/audio/effect/compressor.hpp>
+#include <psemek/audio/effect/volume.hpp>
+#include <psemek/audio/wave/karplus_strong.hpp>
+#include <psemek/audio/wave/sine.hpp>
+#include <psemek/audio/wave/triangle.hpp>
+#include <psemek/audio/effect/filter.hpp>
+#include <psemek/audio/effect/fade_in.hpp>
+#include <psemek/audio/effect/fade_out.hpp>
+#include <psemek/audio/effect/pitch.hpp>
+
 #include <boost/container/flat_set.hpp>
 #include <boost/container/flat_map.hpp>
 
@@ -1327,7 +1339,12 @@ namespace gmtk
 	{
 		application(options const &, context const & context)
 			: context_(context)
+			, audio_(psemek::audio::make_engine())
 		{
+			mixer_ = audio::make_mixer();
+			volume_ = audio::volume(mixer_);
+			audio_->output()->stream(audio::compressor(volume_));
+
 			context_.windowed(is_windowed_);
 			set_start_menu();
 		}
@@ -1390,7 +1407,10 @@ namespace gmtk
 				if (selected_button_)
 				{
 					if (*selected_button_ < menu_buttons_.size() && menu_buttons_[*selected_button_].action)
+					{
+						button_click_sound();
 						menu_buttons_[*selected_button_].action();
+					}
 				}
 				else if (selected_ && active_card_)
 				{
@@ -1398,6 +1418,7 @@ namespace gmtk
 					{
 						if (*active_card_ == card_type::eraser)
 						{
+							destroy_sound();
 							clear_tile(map_, *selected_);
 						}
 						else if (auto t = map_.world->get(*entity).get_if<transformer>())
@@ -1406,6 +1427,7 @@ namespace gmtk
 							{
 								if (map_.take_card(*active_card_))
 								{
+									built_sound();
 									map_.put_card(transformer_to_card(t->type));
 									t->type = *n;
 									active_card_ = std::nullopt;
@@ -1457,7 +1479,10 @@ namespace gmtk
 							}
 
 							if (built)
+							{
 								active_card_ = std::nullopt;
+								built_sound();
+							}
 
 							if (built && tutorial_state_ <= 3)
 								tutorial_state_ = 4;
@@ -1465,7 +1490,10 @@ namespace gmtk
 					}
 				}
 				else if (selected_card_)
+				{
 					active_card_ = *selected_card_;
+					button_click_sound();
+				}
 				else if (selected_item_)
 				{
 					item_killing_spree_ = true;
@@ -1473,7 +1501,10 @@ namespace gmtk
 						tutorial_state_ = 5;
 				}
 				else if (selected_ && !belt_start_)
+				{
 					belt_start_ = *selected_;
+					button_mouseover_sound();
+				}
 			}
 
 			if (!event.down && event.button == app::mouse_button::left)
@@ -1505,16 +1536,22 @@ namespace gmtk
 						{
 							for (int i = 0; i < 3; ++i)
 								remove_belt(*map_.world, e[i], e[i + 1]);
+
+							remove_belt_sound();
 						}
 						else if (sv.belts_from.contains(e[1]))
 						{
 							for (int i = 0; i < 3; ++i)
 								remove_belt(*map_.world, e[i + 1], e[i]);
+
+							remove_belt_sound();
 						}
 						else
 						{
 							for (int i = 0; i < 3; ++i)
 								add_belt(*map_.world, e[i], e[i + 1]);
+
+							add_belt_sound();
 						}
 
 						if (tutorial_state_ <= 0)
@@ -1892,6 +1929,7 @@ namespace gmtk
 				1.f - mouse_[1] * 1.f / screen_size_[1]
 			);
 
+			auto old_selected = selected_;
 			selected_ = std::nullopt;
 			selected_item_ = std::nullopt;
 
@@ -1954,6 +1992,11 @@ namespace gmtk
 					else if (!within_grid(p))
 						if (auto entity = map_.world->index<index>().find(p))
 							selected_ = p;
+
+					if (belt_start_ && selected_ && old_selected != selected_)
+					{
+						button_mouseover_sound();
+					}
 				}
 			}
 
@@ -2159,6 +2202,7 @@ namespace gmtk
 				}
 			}
 
+			auto old_selected_card = selected_card_;
 			selected_card_ = std::nullopt;
 
 			{
@@ -2183,6 +2227,8 @@ namespace gmtk
 					else if (geom::contains(box, mouse_world_))
 					{
 						selected_card_ = type;
+						if (old_selected_card != type)
+							button_mouseover_sound();
 						draw_selection(box, painter_, {128, 128, 128, 255});
 					}
 
@@ -2274,6 +2320,7 @@ namespace gmtk
 				painter_.text(pen, is_sandbox_mode_ ? "Sandbox" : is_challenge_mode_ ? "Challenge" : "Campaign", opts);
 			}
 
+			auto old_selected_button = selected_button_;
 			selected_button_ = std::nullopt;
 
 			if (in_menu())
@@ -2304,7 +2351,11 @@ namespace gmtk
 						box = geom::expand(box, menu_buttons_[i].selected_state * 8.f * pixel_size);
 
 						if (geom::contains(box, mouse_world_))
+						{
 							selected_button_ = i;
+							if (old_selected_button != i)
+								button_mouseover_sound();
+						}
 
 						bg_color = gfx::lerp(gfx::color_rgba{192, 192, 192, 255}, gfx::white.as_color_rgba(), menu_buttons_[i].selected_state);
 						text_color = gfx::lerp(gfx::black.as_color_rgba(), gfx::color_rgba{191, 96, 0, 255}, menu_buttons_[i].selected_state);
@@ -2331,6 +2382,13 @@ namespace gmtk
 		}
 
 	private:
+		context const & context_;
+		bool is_windowed_ = false;
+
+		std::unique_ptr<audio::engine> audio_;
+		audio::mixer_ptr mixer_;
+		std::shared_ptr<audio::volume_control> volume_;
+
 		bool running_ = true;
 
 		bool in_start_menu_ = true;
@@ -2452,9 +2510,6 @@ namespace gmtk
 			menu_buttons_.push_back({"Exit", [this]{ stop(); }});
 		}
 
-		context const & context_;
-		bool is_windowed_ = false;
-
 		random::generator map_rng_;
 		random::generator item_rng_;
 		map map_;
@@ -2490,6 +2545,42 @@ namespace gmtk
 		util::hash_map<card_type, float> card_animation_;
 
 		int tutorial_state_ = 0;
+
+		void button_mouseover_sound()
+		{
+			mixer_->add(audio::volume(audio::fade_out(audio::fade_in(audio::triangle_wave(110.f), 0.00625f), 0.05f), 0.25f));
+		}
+
+		void button_click_sound()
+		{
+			mixer_->add(audio::volume(audio::fade_out(audio::fade_in(audio::triangle_wave(220.f), 0.00625f), 0.1f), 0.25f));
+		}
+
+		void built_sound()
+		{
+			auto base = audio::fade_out(audio::fade_in(audio::triangle_wave(110.f), 0.00625f), 0.5f);
+			auto pitch = audio::pitch(base, 1.f, 0.5f);
+			pitch->pitch(1.5f);
+			mixer_->add(audio::volume(pitch, 0.25f));
+		}
+
+		void add_belt_sound()
+		{
+			mixer_->add(audio::volume(audio::fade_out(audio::fade_in(audio::sine_wave(165.f), 1/160.f), 1/40.f, 1/160.f), 0.25f));
+		}
+
+		void remove_belt_sound()
+		{
+			mixer_->add(audio::volume(audio::fade_out(audio::fade_in(audio::sine_wave(110.f), 1/160.f), 1/20.f, 1/160.f), 0.25f));
+		}
+
+		void destroy_sound()
+		{
+			auto base = audio::fade_out(audio::fade_in(audio::triangle_wave(110.f), 0.00625f), 0.25f);
+			auto pitch = audio::pitch(base, 1.f, 0.25f);
+			pitch->pitch(0.666f);
+			mixer_->add(audio::volume(pitch, 0.25f));
+		}
 	};
 
 }