diff --git a/core/src/signal_path/stream.cpp b/core/src/signal_path/stream.cpp
index 8a969269..8255fb0a 100644
--- a/core/src/signal_path/stream.cpp
+++ b/core/src/signal_path/stream.cpp
@@ -33,7 +33,7 @@ SinkEntry::SinkEntry(StreamManager* manager, AudioStream* parentStream, const st
     setType(type);
 }
 
-std::string SinkEntry::getType() {
+std::string SinkEntry::getType() const {
     std::lock_guard<std::recursive_mutex> lck(mtx);
     return type;
 }
@@ -67,7 +67,7 @@ SinkID SinkEntry::getID() const {
     return id;
 }
 
-float SinkEntry::getVolume() {
+float SinkEntry::getVolume() const {
     std::lock_guard<std::recursive_mutex> lck(mtx);
     return volume;
 }
@@ -79,7 +79,7 @@ void SinkEntry::setVolume(float volume) {
     onVolumeChanged(volume);
 }
 
-bool SinkEntry::getMuted() {
+bool SinkEntry::getMuted() const {
     std::lock_guard<std::recursive_mutex> lck(mtx);
     return muted;
 }
@@ -91,7 +91,7 @@ void SinkEntry::setMuted(bool muted) {
     onMutedChanged(muted);
 }
 
-float SinkEntry::getPanning() {
+float SinkEntry::getPanning() const {
     std::lock_guard<std::recursive_mutex> lck(mtx);
     return panning;
 }
@@ -118,7 +118,7 @@ void SinkEntry::stopSink() {
     sink->stop();
 }
 
-std::lock_guard<std::recursive_mutex> SinkEntry::getLock() {
+std::lock_guard<std::recursive_mutex> SinkEntry::getLock() const {
     return std::lock_guard<std::recursive_mutex>(mtx);
 }
 
@@ -152,7 +152,7 @@ void SinkEntry::setInputSamplerate(double samplerate) {
     resamp.setInSamplerate(samplerate);
 }
 
-std::string SinkEntry::getStringID() {
+std::string SinkEntry::getStringID() const {
     return stringId;
 }
 
diff --git a/core/src/signal_path/stream.h b/core/src/signal_path/stream.h
index 6821e2df..839f5f63 100644
--- a/core/src/signal_path/stream.h
+++ b/core/src/signal_path/stream.h
@@ -71,7 +71,7 @@ public:
      * Get the type of the sink.
      * @return Type of the sink.
     */
-    std::string getType();
+    std::string getType() const;
 
     /**
      * Change the type of the sink.
@@ -89,7 +89,7 @@ public:
      * Get sink volume.
      * @return Volume as value between 0.0 and 1.0.
     */
-    float getVolume();
+    float getVolume() const;
 
     /**
      * Set sink volume.
@@ -101,7 +101,7 @@ public:
      * Check if the sink is muted.
      * @return True if muted, false if not.
     */
-    bool getMuted();
+    bool getMuted() const;
 
     /**
      * Set wether or not the sink is muted
@@ -113,7 +113,7 @@ public:
      * Get sink panning.
      * @return Panning as value between -1.0 and 1.0 meaning panning to the left and right respectively.
     */
-    float getPanning();
+    float getPanning() const;
 
     /**
      * Set sink panning.
@@ -130,7 +130,7 @@ public:
      * Get the string form ID unique to both the sink and stream. Be used to reference settings.
      * @return Unique string ID.
     */
-    std::string getStringID();
+    std::string getStringID() const;
 
     // Emitted when the type of the sink was changed
     NewEvent<const std::string&> onTypeChanged;
@@ -143,7 +143,7 @@ public:
 
     // TODO: Need to allow the sink to change the entry samplerate and start/stop the DSP
     //       This will also require allowing it to get a lock on the sink so others don't attempt to mess with it.
-    std::lock_guard<std::recursive_mutex> getLock();
+    std::lock_guard<std::recursive_mutex> getLock() const;
     void startDSP();
     void stopDSP();
     void setSamplerate(double samplerate);
@@ -155,7 +155,7 @@ private:
     void destroy(bool forgetSettings);
     void setInputSamplerate(double samplerate);
 
-    std::recursive_mutex mtx;
+    mutable std::recursive_mutex mtx;
     dsp::stream<dsp::stereo_t> input;
     dsp::multirate::RationalResampler<dsp::stereo_t> resamp;
     dsp::audio::Volume volumeAdjust;