11 files changed, 13 insertions, 13 deletions
diff --git a/drumgizmo/input/inputdummy.cc b/drumgizmo/input/inputdummy.cc
index 7d7b272..971ef29 100644
--- a/drumgizmo/input/inputdummy.cc
+++ b/drumgizmo/input/inputdummy.cc
@@ -34,7 +34,7 @@ DummyInputEngine::~DummyInputEngine()
 {
 }
 
-bool DummyInputEngine::init(Instruments& instruments)
+bool DummyInputEngine::init(const Instruments& instruments)
 {
 	return true;
 }
diff --git a/drumgizmo/input/inputdummy.h b/drumgizmo/input/inputdummy.h
index f2353e5..7888f33 100644
--- a/drumgizmo/input/inputdummy.h
+++ b/drumgizmo/input/inputdummy.h
@@ -35,7 +35,7 @@ public:
 	~DummyInputEngine();
 
 	// based on AudioInputEngine
-	bool init(Instruments& instruments) override;
+	bool init(const Instruments& instruments) override;
 	void setParm(const std::string& parm, const std::string& value) override;
 	bool start() override;
 	void stop() override;
diff --git a/drumgizmo/input/jackmidi.cc b/drumgizmo/input/jackmidi.cc
index befb763..73098c5 100644
--- a/drumgizmo/input/jackmidi.cc
+++ b/drumgizmo/input/jackmidi.cc
@@ -48,7 +48,7 @@ JackMidiInputEngine::~JackMidiInputEngine()
 	client.remove(*this);
 }
 
-bool JackMidiInputEngine::init(Instruments& instruments)
+bool JackMidiInputEngine::init(const Instruments& instruments)
 {
 	if(!loadMidiMap(midimap, instruments))
 	{
diff --git a/drumgizmo/input/jackmidi.h b/drumgizmo/input/jackmidi.h
index 5e9e48f..15707c4 100644
--- a/drumgizmo/input/jackmidi.h
+++ b/drumgizmo/input/jackmidi.h
@@ -43,7 +43,7 @@ public:
 	~JackMidiInputEngine();
 
 	// based on AudioInputEngineMidi
-	bool init(Instruments& instruments) override;
+	bool init(const Instruments& instruments) override;
 	void setParm(const std::string& parm, const std::string& value) override;
 	bool start() override;
 	void stop() override;
diff --git a/drumgizmo/input/midifile.cc b/drumgizmo/input/midifile.cc
index 2149029..76dff12 100644
--- a/drumgizmo/input/midifile.cc
+++ b/drumgizmo/input/midifile.cc
@@ -52,7 +52,7 @@ MidifileInputEngine::~MidifileInputEngine()
 	}
 }
 
-bool MidifileInputEngine::init(Instruments& instruments)
+bool MidifileInputEngine::init(const Instruments& instruments)
 {
 	if(file == "")
 	{
diff --git a/drumgizmo/input/midifile.h b/drumgizmo/input/midifile.h
index ff2e3b6..08dc249 100644
--- a/drumgizmo/input/midifile.h
+++ b/drumgizmo/input/midifile.h
@@ -42,7 +42,7 @@ public:
 	~MidifileInputEngine();
 
 	// based on AudioInputEngineMidi
-	bool init(Instruments& instruments) override;
+	bool init(const Instruments& instruments) override;
 	void setParm(const std::string& parm, const std::string& value) override;
 	bool start() override;
 	void stop() override;
diff --git a/plugin/drumgizmo_plugin.cc b/plugin/drumgizmo_plugin.cc
index 4e3252d..f1cebd3 100644
--- a/plugin/drumgizmo_plugin.cc
+++ b/plugin/drumgizmo_plugin.cc
@@ -182,7 +182,7 @@ DrumGizmoPlugin::Input::Input(DrumGizmoPlugin& plugin)
 {
 }
 
-bool DrumGizmoPlugin::Input::init(Instruments &instruments)
+bool DrumGizmoPlugin::Input::init(const Instruments &instruments)
 {
 	this->instruments = &instruments;
 	return true;
diff --git a/plugin/drumgizmo_plugin.h b/plugin/drumgizmo_plugin.h
index bd970f1..767060c 100644
--- a/plugin/drumgizmo_plugin.h
+++ b/plugin/drumgizmo_plugin.h
@@ -108,7 +108,7 @@ private:
 	public:
 		Input(DrumGizmoPlugin& plugin);
 
-		bool init(Instruments& instruments) override;
+		bool init(const Instruments& instruments) override;
 
 		void setParm(const std::string& parm, const std::string& value) override;
 
@@ -121,7 +121,7 @@ private:
 
 	protected:
 		DrumGizmoPlugin& plugin;
-		Instruments* instruments{nullptr};
+		const Instruments* instruments{nullptr};
 	};
 
 	class Output
diff --git a/src/audioinputengine.h b/src/audioinputengine.h
index d7ac9c9..105db49 100644
--- a/src/audioinputengine.h
+++ b/src/audioinputengine.h
@@ -40,7 +40,7 @@ public:
 
   virtual bool isMidiEngine() { return false; } 
 
-  virtual bool init(Instruments& instruments) = 0;
+  virtual bool init(const Instruments& instruments) = 0;
 
   virtual void setParm(const std::string& parm, const std::string& value) = 0;
 
diff --git a/src/audioinputenginemidi.cc b/src/audioinputenginemidi.cc
index e3cb796..e18e446 100644
--- a/src/audioinputenginemidi.cc
+++ b/src/audioinputenginemidi.cc
@@ -38,7 +38,7 @@ AudioInputEngineMidi::AudioInputEngineMidi()
   is_valid = false;
 }
 
-bool AudioInputEngineMidi::loadMidiMap(std::string file, Instruments &instruments)
+bool AudioInputEngineMidi::loadMidiMap(const std::string& file, const Instruments& instruments)
 {
   std::string f = file;
 
diff --git a/src/audioinputenginemidi.h b/src/audioinputenginemidi.h
index 36fcbaa..82121b7 100644
--- a/src/audioinputenginemidi.h
+++ b/src/audioinputenginemidi.h
@@ -43,7 +43,7 @@ public:
 
   bool isMidiEngine() { return true; } 
 
-  virtual bool init(Instruments &instruments) = 0;
+  virtual bool init(const Instruments &instruments) = 0;
 
   virtual void setParm(const std::string& parm, const std::string& value) = 0;
 
@@ -54,7 +54,7 @@ public:
   virtual void run(size_t pos, size_t len, std::vector<event_t>& events) = 0;
   virtual void post() = 0;
 
-  bool loadMidiMap(std::string file, Instruments &i);
+  bool loadMidiMap(const std::string& file, const Instruments& i);
 
   std::string midimapFile();