diff --git a/src/client/client.cpp b/src/client/client.cpp
index 05fae08..a5045db 100644
--- a/src/client/client.cpp
+++ b/src/client/client.cpp
@@ -3,6 +3,9 @@
 #include <cmath>
 #include <stdexcept>
 
+#include <lib/libwebsockets.h>
+#include "../../../beats-server/src/websockets.h"
+
 #include "../../../beats-server/src/json.h"
 #include "../../../beats-server/src/json_ext.h"
 
@@ -18,7 +21,12 @@ namespace games {
 				libwebsocket_callback_on_writable(context, wsi);
 				break;
 			case LWS_CALLBACK_CLIENT_RECEIVE:
-				// std::cout << std::string(static_cast<char*>(in), len) << std::endl;
+				try {
+					auto l = from_json<cheap_line_type>(parse_json(std::string((char*)in, len)));
+					current_client->add_line(l);
+				} catch(std::exception& e){
+					throw websockets::runtime_error(e.what());
+				}
 				break;
 			case LWS_CALLBACK_CLIENT_WRITEABLE:{
 				js::Object ret;
@@ -47,6 +55,13 @@ namespace games {
 		{ NULL, NULL, 0 }
 	};
 
+	void update_pitches(Client& client){
+		for(auto & l : client.lines){
+			auto& sound = l->sound;
+			sound->set_pitch(pitch_for_midi_note(client.scale.note_for_length(std::sqrt(l->sqr_length()))));
+		}
+	}
+
 	void Client::add_line(cheap_line_type const & line_in){
 		auto line = create_instrument(line_in);
 		line->sound.reset(new motor::al::Source(sounds[line->line_kind]));
@@ -57,19 +72,13 @@ namespace games {
 		}
 
 		lines_changed = true;
+		update_pitches(*this);
 	}
 
 	bool Client::has_ended(){
 		return false;
 	}
 
-	void update_pitches(Client& client){
-		for(auto & l : client.lines){
-			auto& sound = l->sound;
-			sound->set_pitch(pitch_for_midi_note(client.scale.note_for_length(std::sqrt(l->sqr_length()))));
-		}
-	}
-
 	Client::Client(int window_width_, int window_height_, std::shared_ptr<Base>& active_base_)
 	: Base(window_width_, window_height_, active_base_)
 	{
@@ -78,15 +87,14 @@ namespace games {
 		}
 		current_client = this;
 
+		// sound
+		scale = Scale::load_from_file(*current_scale);
+
 		// simulation
 		beat.notes.emplace_back(note_type::kQuarterNote, note_info{100.0f, 100.0f});
 		cheap_line_type line{{{50.0f, 100.0f}, {150.0f, 200.0f}, simulation::kOneWay}};
 		add_line(line);
 
-		// sound
-		scale = Scale::load_from_file(*current_scale);
-		update_pitches(*this);
-
 		// websockets
 		lws_context_creation_info info;
 		memset(&info, 0, sizeof info);
diff --git a/src/client/client.hpp b/src/client/client.hpp
index 865e752..a41b98f 100644
--- a/src/client/client.hpp
+++ b/src/client/client.hpp
@@ -40,8 +40,8 @@ namespace games {
 			::bundle.get_sound_path() + "pentatonic"
 		};
 		const std::vector<std::shared_ptr<motor::al::Buffer>> sounds{
-			resource_cache.get_sound_buffer(::bundle.get_sound_path() + "marimba.wav"),
-			resource_cache.get_sound_buffer(::bundle.get_sound_path() + "guitar440.wav")
+			resource_cache.get_sound_buffer(::bundle.get_sound_path() + "guitar440.wav"),
+			resource_cache.get_sound_buffer(::bundle.get_sound_path() + "marimba.wav")
 		};
 		std::vector<std::string>::const_iterator current_scale{scales.begin()};
 		Scale scale;
diff --git a/src/client/client_common.hpp b/src/client/client_common.hpp
index 35608a6..2d6a8bc 100644
--- a/src/client/client_common.hpp
+++ b/src/client/client_common.hpp
@@ -103,6 +103,7 @@ struct cheap_line_type {
 	IntVec2 end_point;
 	int line_kind;
 
+	cheap_line_type() = default;
 	cheap_line_type(Instrument const & l)
 	: starting_point(l.starting_point)
 	, end_point(l.end_point)