diff --git a/.gitignore b/.gitignore
index 96d5a98..7be1ebb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 zmidimap
 obj
+Zmakefile
diff --git a/include/device.hpp b/include/device.hpp
index c1c0231..b70bcc8 100644
--- a/include/device.hpp
+++ b/include/device.hpp
@@ -17,7 +17,7 @@ public:
   bool start_loop();
   void run_signal(char* buff);
 
-  bool import_chunk(ztd::chunkdat const& ch);
+  bool import_chunk(const ztd::chunkdat& ch);
   ztd::chunkdat export_chunk();
 
   std::string name;
diff --git a/include/system.hpp b/include/system.hpp
index a68fe70..14277df 100644
--- a/include/system.hpp
+++ b/include/system.hpp
@@ -15,6 +15,6 @@ void device_check();
 
 void announce_loop();
 
-void filetime_loop(std::string filepath);
+void filetime_loop(std::string const& filepath);
 
 #endif //SYSTEM_HPP
diff --git a/src/device.cpp b/src/device.cpp
index 3cbc0f2..6a8494e 100644
--- a/src/device.cpp
+++ b/src/device.cpp
@@ -36,7 +36,7 @@ static std::string dequote(const std::string& in)
   return ret;
 }
 
-static bool _isNum(char a)
+static bool _isNum(const char& a)
 {
   return (a>='0' && a<='9');
 }
@@ -63,7 +63,7 @@ bool Device::start_loop()
   return true;
 }
 
-std::pair<int32_t,int32_t> importRange(ztd::chunkdat const& ch, std::string const& tag, int32_t low, int32_t high)
+std::pair<int32_t,int32_t> importRange(const ztd::chunkdat& ch, const std::string& tag, int32_t low, int32_t high)
 {
   ztd::chunkdat* pch=ch.subChunkPtr(tag);
   if(pch != nullptr)
@@ -89,7 +89,7 @@ std::pair<int32_t,int32_t> importRange(ztd::chunkdat const& ch, std::string cons
   return std::make_pair(low, high);
 }
 
-std::pair<float,float> importRangeFloat(ztd::chunkdat const& ch, std::string const& tag, float low, float high)
+std::pair<float,float> importRangeFloat(const ztd::chunkdat& ch, const std::string& tag, float low, float high)
 {
   ztd::chunkdat* pch=ch.subChunkPtr(tag);
   if(pch != nullptr)
@@ -113,7 +113,7 @@ std::pair<float,float> importRangeFloat(ztd::chunkdat const& ch, std::string con
   return std::make_pair(low, high);
 }
 
-bool importBool(ztd::chunkdat const& ch, std::string const& tag, bool defbool)
+bool importBool(const ztd::chunkdat& ch, const std::string& tag, const bool& defbool)
 {
   ztd::chunkdat* pch=ch.subChunkPtr(tag);
   if(pch != nullptr)
@@ -127,7 +127,7 @@ bool importBool(ztd::chunkdat const& ch, std::string const& tag, bool defbool)
   return defbool;
 }
 
-bool Device::import_chunk(ztd::chunkdat const& ch)
+bool Device::import_chunk(const ztd::chunkdat& ch)
 {
   ztd::chunkdat& cch = ch["commands"];
   this->name=dequote(ch["name"].strval());
@@ -177,13 +177,11 @@ bool Device::import_chunk(ztd::chunkdat const& ch)
         uint8_t id_high=127;
         uint8_t low=1;
         uint8_t high=127;
-        std::string tt;
 
         //id
         intpair=importRange(tch, "id", id_low, id_high);
         id_low=intpair.first;
         id_high=intpair.second;
-        // id=stoi(tch["id"].strval());
 
         //trigger
         intpair = importRange(tch, "trigger", low, high);
@@ -317,7 +315,7 @@ void Device::run_signal(char* buff)
       else
       {
         // throw std::runtime_error("Unknown MIDI signal:\n" + std::string(buff));
-        printf("Unsupported signal, ignoring\n");
+        std::cerr << "Unsupported signal, ignoring\n" ;
         return;
       }
 
diff --git a/src/main.cpp b/src/main.cpp
index 0c7dc3c..37c671e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -156,6 +156,8 @@ int main(int argc, char* argv[])
   catch(ztd::option_error& err)
   {
     printf("%s\n", err.what());
+    if(err.type() == ztd::option_error::unknown_option)
+      help();
     stop(1);
   }
 
@@ -273,8 +275,8 @@ int main(int argc, char* argv[])
     //main loop
     log("Starting scan for devices\n");
     if(autoreload)
-      std::thread(filetime_loop, filepath).detach();
-    announce_loop();
+      std::thread(filetime_loop, filepath).detach(); // start the killer thread
+    announce_loop(); // loop until killed
     ztd::chunkdat bak_data = file.data();
     while(autoreload)
     {
@@ -297,7 +299,7 @@ int main(int argc, char* argv[])
         log("Reloading old config\n");
         load_commands(bak_data);
       }
-      announce_loop();
+      announce_loop(); // loop until killed
     }
   }
   catch (ztd::format_error& e)
diff --git a/src/system.cpp b/src/system.cpp
index 47dd4f3..92e24e4 100644
--- a/src/system.cpp
+++ b/src/system.cpp
@@ -102,7 +102,7 @@ void announce_loop()
     free(buff);
 }
 
-void filetime_loop(std::string filepath)
+void filetime_loop(std::string const& filepath)
 {
   struct stat attrib;
   stat(filepath.c_str(), &attrib);