6 files changed, 6 insertions, 6 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;