diff --git a/src/content/content.hpp b/src/content/content.hpp
index 75925bb..e763592 100644
--- a/src/content/content.hpp
+++ b/src/content/content.hpp
@@ -32,18 +32,5 @@ namespace Content1::Components {
 		entt::dense_set<Contact3> participants;
 	};
 
-	struct ReadHeadHint {
-		// points to the first byte we want
-		// this is just a hint, that can be set from outside
-		// to guide the sequential "piece picker" strategy
-		// the strategy *should* set this to the first byte we dont yet have
-		uint64_t offset_into_file {0u};
-	};
-
 } // Content::Components
 
-// TODO: i have no idea
-struct RawFile2ReadFromContentFactoryI {
-	virtual std::shared_ptr<File2I> open(ObjectHandle h) = 0;
-};
-
diff --git a/src/debug_tox_call.cpp b/src/debug_tox_call.cpp
index a84d20c..5a5888c 100644
--- a/src/debug_tox_call.cpp
+++ b/src/debug_tox_call.cpp
@@ -274,15 +274,19 @@ DebugToxCall::~DebugToxCall(void) {
 
 	for (auto& [fid, call] : _calls) {
 		if (static_cast<bool>(call.incoming_vsrc)) {
+			_os.throwEventDestroy(call.incoming_vsrc);
 			call.incoming_vsrc.destroy();
 		}
 		if (static_cast<bool>(call.incoming_asrc)) {
+			_os.throwEventDestroy(call.incoming_asrc);
 			call.incoming_asrc.destroy();
 		}
 		if (static_cast<bool>(call.outgoing_vsink)) {
+			_os.throwEventDestroy(call.outgoing_vsink);
 			call.outgoing_vsink.destroy();
 		}
 		if (static_cast<bool>(call.outgoing_asink)) {
+			_os.throwEventDestroy(call.outgoing_asink);
 			call.outgoing_asink.destroy();
 		}
 	}
@@ -375,14 +379,16 @@ float DebugToxCall::render(void) {
 							auto new_vsink = std::make_unique<ToxAVCallVideoSink>(_toxav, fid);
 							call.outgoing_vsink.emplace<ToxAVCallVideoSink*>(new_vsink.get());
 							call.outgoing_vsink.emplace<Components::FrameStream2Sink<SDLVideoFrame>>(std::move(new_vsink));
-							call.outgoing_vsink.emplace<Components::StreamSink>("ToxAV friend call video", std::string{entt::type_name<SDLVideoFrame>::value()});
+							call.outgoing_vsink.emplace<Components::StreamSink>(Components::StreamSink::create<SDLVideoFrame>("ToxAV friend call video"));
+							_os.throwEventConstruct(call.outgoing_vsink);
 						}
 						call.outgoing_asink = {_os.registry(), _os.registry().create()};
 						{
 							auto new_asink = std::make_unique<ToxAVCallAudioSink>(_toxav, fid);
 							call.outgoing_asink.emplace<ToxAVCallAudioSink*>(new_asink.get());
 							call.outgoing_asink.emplace<Components::FrameStream2Sink<AudioFrame>>(std::move(new_asink));
-							call.outgoing_asink.emplace<Components::StreamSink>("ToxAV friend call audio", std::string{entt::type_name<AudioFrame>::value()});
+							call.outgoing_asink.emplace<Components::StreamSink>(Components::StreamSink::create<AudioFrame>("ToxAV friend call audio"));
+							_os.throwEventConstruct(call.outgoing_asink);
 						}
 
 						// create sources
@@ -392,7 +398,8 @@ float DebugToxCall::render(void) {
 								auto new_vsrc = std::make_unique<SDLVideoFrameStream2MultiSource>();
 								call.incoming_vsrc.emplace<SDLVideoFrameStream2MultiSource*>(new_vsrc.get());
 								call.incoming_vsrc.emplace<Components::FrameStream2Source<SDLVideoFrame>>(std::move(new_vsrc));
-								call.incoming_vsrc.emplace<Components::StreamSource>("ToxAV friend call video", std::string{entt::type_name<SDLVideoFrame>::value()});
+								call.incoming_vsrc.emplace<Components::StreamSource>(Components::StreamSource::create<SDLVideoFrame>("ToxAV friend call video"));
+								_os.throwEventConstruct(call.incoming_vsrc);
 							}
 						}
 						if (call.incoming_a) {
@@ -401,7 +408,8 @@ float DebugToxCall::render(void) {
 								auto new_asrc = std::make_unique<AudioFrameStream2MultiSource>();
 								call.incoming_asrc.emplace<AudioFrameStream2MultiSource*>(new_asrc.get());
 								call.incoming_asrc.emplace<Components::FrameStream2Source<AudioFrame>>(std::move(new_asrc));
-								call.incoming_asrc.emplace<Components::StreamSource>("ToxAV friend call audio", std::string{entt::type_name<AudioFrame>::value()});
+								call.incoming_asrc.emplace<Components::StreamSource>(Components::StreamSource::create<AudioFrame>("ToxAV friend call audio"));
+								_os.throwEventConstruct(call.incoming_asrc);
 							}
 						}
 					}
@@ -418,15 +426,19 @@ float DebugToxCall::render(void) {
 
 						// TODO: stream manager disconnectAll()
 						if (static_cast<bool>(call.incoming_vsrc)) {
+							_os.throwEventDestroy(call.incoming_vsrc);
 							call.incoming_vsrc.destroy();
 						}
 						if (static_cast<bool>(call.incoming_asrc)) {
+							_os.throwEventDestroy(call.incoming_asrc);
 							call.incoming_asrc.destroy();
 						}
 						if (static_cast<bool>(call.outgoing_vsink)) {
+							_os.throwEventDestroy(call.outgoing_vsink);
 							call.outgoing_vsink.destroy();
 						}
 						if (static_cast<bool>(call.outgoing_asink)) {
+							_os.throwEventDestroy(call.outgoing_asink);
 							call.outgoing_asink.destroy();
 						}
 					}
@@ -468,15 +480,19 @@ bool DebugToxCall::onEvent(const Events::FriendCallState& e)  {
 		(call.state & TOXAV_FRIEND_CALL_STATE_ERROR) != 0
 	) {
 		if (static_cast<bool>(call.incoming_vsrc)) {
+			_os.throwEventDestroy(call.incoming_vsrc);
 			call.incoming_vsrc.destroy();
 		}
 		if (static_cast<bool>(call.incoming_asrc)) {
+			_os.throwEventDestroy(call.incoming_asrc);
 			call.incoming_asrc.destroy();
 		}
 		if (static_cast<bool>(call.outgoing_vsink)) {
+			_os.throwEventDestroy(call.outgoing_vsink);
 			call.outgoing_vsink.destroy();
 		}
 		if (static_cast<bool>(call.outgoing_asink)) {
+			_os.throwEventDestroy(call.outgoing_asink);
 			call.outgoing_asink.destroy();
 		}
 	}
diff --git a/src/debug_video_tap.cpp b/src/debug_video_tap.cpp
index f76bdcc..1ede8a8 100644
--- a/src/debug_video_tap.cpp
+++ b/src/debug_video_tap.cpp
@@ -58,7 +58,7 @@ DebugVideoTap::DebugVideoTap(ObjectStore2& os, StreamManager& sm, TextureUploade
 			std::move(dvts)
 		);
 
-		_tap.emplace<Components::StreamSink>("DebugVideoTap", std::string{entt::type_name<SDLVideoFrame>::value()});
+		_tap.emplace<Components::StreamSink>(Components::StreamSink::create<SDLVideoFrame>("DebugVideoTap"));
 	} catch (...) {
 		_os.registry().destroy(_tap);
 	}
diff --git a/src/main_screen.cpp b/src/main_screen.cpp
index e7de762..00cd09f 100644
--- a/src/main_screen.cpp
+++ b/src/main_screen.cpp
@@ -154,7 +154,9 @@ MainScreen::MainScreen(SimpleConfigModel&& conf_, SDL_Renderer* renderer_, Theme
 					std::make_unique<SDLVideoCameraContent>()
 				);
 
-				vsrc.emplace<Components::StreamSource>("WebCam", std::string{entt::type_name<SDLVideoFrame>::value()});
+				vsrc.emplace<Components::StreamSource>(Components::StreamSource::create<SDLVideoFrame>("WebCam"));
+
+				os.throwEventConstruct(vsrc);
 			} catch (...) {
 				os.registry().destroy(vsrc);
 			}
@@ -176,7 +178,9 @@ MainScreen::MainScreen(SimpleConfigModel&& conf_, SDL_Renderer* renderer_, Theme
 					std::make_unique<SDLAudioOutputDeviceDefaultSink>()
 				);
 
-				asink.emplace<Components::StreamSink>("LoudSpeaker", std::string{entt::type_name<AudioFrame>::value()});
+				asink.emplace<Components::StreamSink>(Components::StreamSink::create<AudioFrame>("LoudSpeaker"));
+
+				os.throwEventConstruct(asink);
 			} catch (...) {
 				os.registry().destroy(asink);
 			}
diff --git a/src/stream_manager.hpp b/src/stream_manager.hpp
index 0dc1353..e19aa06 100644
--- a/src/stream_manager.hpp
+++ b/src/stream_manager.hpp
@@ -13,17 +13,26 @@
 #include <thread>
 #include <chrono>
 
+// fwd
+class StreamManager;
+
 namespace Components {
 	struct StreamSource {
 		std::string name;
 		std::string frame_type_name;
-		// TODO: connect fn
+
+		std::function<bool(StreamManager&, Object, Object, bool)> connect_fn;
+
+		template<typename FrameType>
+		static StreamSource create(const std::string& name);
 	};
 
 	struct StreamSink {
 		std::string name;
 		std::string frame_type_name;
-		// TODO: connect fn
+
+		template<typename FrameType>
+		static StreamSink create(const std::string& name);
 	};
 
 	template<typename FrameType>
@@ -102,8 +111,6 @@ class StreamManager {
 			}
 		}
 
-		// TODO: default typed sources and sinks
-
 		// stream type is FrameStream2I<FrameType>
 		// TODO: improve this design
 		// src and sink need to be a FrameStream2MultiStream<FrameType>
@@ -135,14 +142,6 @@ class StreamManager {
 				return false;
 			}
 
-			// HACK:
-			if (!h_src.all_of<Components::StreamSource>()) {
-				h_src.emplace<Components::StreamSource>("", std::string{entt::type_name<FrameType>::value()});
-			}
-			if (!h_sink.all_of<Components::StreamSink>()) {
-				h_sink.emplace<Components::StreamSink>("", std::string{entt::type_name<FrameType>::value()});
-			}
-
 			auto& src_stream = h_src.get<Components::FrameStream2Source<FrameType>>();
 			auto& sink_stream = h_sink.get<Components::FrameStream2Sink<FrameType>>();
 
@@ -195,6 +194,43 @@ class StreamManager {
 			return true;
 		}
 
+		bool connect(Object src, Object sink, bool threaded = true) {
+			auto h_src = _os.objectHandle(src);
+			auto h_sink = _os.objectHandle(sink);
+			if (!static_cast<bool>(h_src) || !static_cast<bool>(h_sink)) {
+				// an object does not exist
+				return false;
+			}
+
+			// get src and sink comps
+			if (!h_src.all_of<Components::StreamSource>()) {
+				// src not stream source
+				return false;
+			}
+
+			if (!h_sink.all_of<Components::StreamSink>()) {
+				// sink not stream sink
+				return false;
+			}
+
+			const auto& ssrc = h_src.get<Components::StreamSource>();
+			const auto& ssink = h_sink.get<Components::StreamSink>();
+
+			// compare type
+			if (ssrc.frame_type_name != ssink.frame_type_name) {
+				return false;
+			}
+
+			// always fail in debug mode
+			assert(static_cast<bool>(ssrc.connect_fn));
+			if (!static_cast<bool>(ssrc.connect_fn)) {
+				return false;
+			}
+
+			// use connect fn from src
+			return ssrc.connect_fn(*this, src, sink, threaded);
+		}
+
 		template<typename StreamType>
 		bool disconnect(Object src, Object sink) {
 			auto res = std::find_if(
@@ -258,3 +294,27 @@ class StreamManager {
 		}
 };
 
+namespace Components {
+
+	// we require the complete sm type here
+	template<typename FrameType>
+	StreamSource StreamSource::create(const std::string& name) {
+		return StreamSource{
+			name,
+			std::string{entt::type_name<FrameType>::value()},
+			+[](StreamManager& sm, Object src, Object sink, bool threaded) {
+				return sm.connect<FrameType>(src, sink, threaded);
+			},
+		};
+	}
+
+	template<typename FrameType>
+	StreamSink StreamSink::create(const std::string& name) {
+		return StreamSink{
+			name,
+			std::string{entt::type_name<FrameType>::value()},
+		};
+	}
+
+} // Components
+
diff --git a/src/stream_manager_ui.cpp b/src/stream_manager_ui.cpp
index 9b47341..57b6332 100644
--- a/src/stream_manager_ui.cpp
+++ b/src/stream_manager_ui.cpp
@@ -1,8 +1,5 @@
 #include "./stream_manager_ui.hpp"
 
-#include "./content/sdl_video_frame_stream2.hpp"
-#include "./content/audio_stream.hpp"
-
 #include <solanaceae/object_store/object_store.hpp>
 
 #include <imgui/imgui.h>
@@ -42,7 +39,7 @@ void StreamManagerUI::render(void) {
 
 		// by fametype ??
 
-		if (ImGui::CollapsingHeader("Sources")) {
+		if (ImGui::CollapsingHeader("Sources", ImGuiTreeNodeFlags_DefaultOpen)) {
 			// list sources
 			if (ImGui::BeginTable("sources_and_sinks", 4, ImGuiTableFlags_SizingFixedFit | ImGuiTableFlags_BordersInnerV)) {
 				ImGui::TableSetupColumn("id");
@@ -65,7 +62,34 @@ void StreamManagerUI::render(void) {
 
 					ImGui::TableNextColumn();
 					if (ImGui::SmallButton("->")) {
-						// TODO: list type sinks
+						ImGui::OpenPopup("src_connect");
+					}
+					if (ImGui::BeginPopup("src_connect")) {
+						if (ImGui::BeginMenu("connect to")) {
+							for (const auto& [oc_sink, s_sink] : _os.registry().view<Components::StreamSink>().each()) {
+								if (s_sink.frame_type_name != ss.frame_type_name) {
+									continue;
+								}
+
+								ImGui::PushID(entt::to_integral(oc_sink));
+
+								std::string sink_label {"src "};
+								sink_label += std::to_string(entt::to_integral(entt::to_entity(oc_sink)));
+								sink_label += " (";
+								sink_label += s_sink.name;
+								sink_label += ")[";
+								sink_label += s_sink.frame_type_name;
+								sink_label += "]";
+								if (ImGui::MenuItem(sink_label.c_str())) {
+									_sm.connect(oc, oc_sink);
+								}
+
+								ImGui::PopID();
+							}
+
+							ImGui::EndMenu();
+						}
+						ImGui::EndPopup();
 					}
 
 					ImGui::TableNextColumn();
@@ -78,7 +102,7 @@ void StreamManagerUI::render(void) {
 			}
 		} // sources header
 
-		if (ImGui::CollapsingHeader("Sinks")) {
+		if (ImGui::CollapsingHeader("Sinks", ImGuiTreeNodeFlags_DefaultOpen)) {
 			// list sinks
 			if (ImGui::BeginTable("sources_and_sinks", 4, ImGuiTableFlags_SizingFixedFit | ImGuiTableFlags_BordersInnerV)) {
 				ImGui::TableSetupColumn("id");
@@ -89,8 +113,6 @@ void StreamManagerUI::render(void) {
 				ImGui::TableHeadersRow();
 
 				for (const auto& [oc, ss] : _os.registry().view<Components::StreamSink>().each()) {
-					//ImGui::Text("sink %d (%s)[%s]", entt::to_integral(entt::to_entity(oc)), ss.name.c_str(), ss.frame_type_name.c_str());
-
 					ImGui::PushID(entt::to_integral(oc));
 
 					ImGui::TableNextColumn();
@@ -102,10 +124,11 @@ void StreamManagerUI::render(void) {
 
 					ImGui::TableNextColumn();
 					if (ImGui::SmallButton("->")) {
-						// TODO: list type sinks
+						ImGui::OpenPopup("sink_connect");
 					}
-					if (ImGui::BeginPopupContextItem("sink_connect")) {
-						if (ImGui::BeginMenu("connect video", ss.frame_type_name == entt::type_name<SDLVideoFrame>::value())) {
+					// ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings
+					if (ImGui::BeginPopup("sink_connect")) {
+						if (ImGui::BeginMenu("connect to")) {
 							for (const auto& [oc_src, s_src] : _os.registry().view<Components::StreamSource>().each()) {
 								if (s_src.frame_type_name != ss.frame_type_name) {
 									continue;
@@ -121,32 +144,7 @@ void StreamManagerUI::render(void) {
 								source_label += s_src.frame_type_name;
 								source_label += "]";
 								if (ImGui::MenuItem(source_label.c_str())) {
-									_sm.connect<SDLVideoFrame>(oc_src, oc);
-								}
-
-								ImGui::PopID();
-							}
-
-							ImGui::EndMenu();
-						}
-
-						if (ImGui::BeginMenu("connect audio", ss.frame_type_name == entt::type_name<AudioFrame>::value())) {
-							for (const auto& [oc_src, s_src] : _os.registry().view<Components::StreamSource>().each()) {
-								if (s_src.frame_type_name != ss.frame_type_name) {
-									continue;
-								}
-
-								ImGui::PushID(entt::to_integral(oc_src));
-
-								std::string source_label {"src "};
-								source_label += std::to_string(entt::to_integral(entt::to_entity(oc_src)));
-								source_label += " (";
-								source_label += s_src.name;
-								source_label += ")[";
-								source_label += s_src.frame_type_name;
-								source_label += "]";
-								if (ImGui::MenuItem(source_label.c_str())) {
-									_sm.connect<AudioFrame>(oc_src, oc);
+									_sm.connect(oc_src, oc);
 								}
 
 								ImGui::PopID();