Use doubles instead of floats for the time argument in Source:seek. This probably won't affect anything meaningfully, but in theory it's more precise.

src/modules/audio/null/Source.cpp

@@ -90,11 +90,11 @@ float Source::getVolume() const
 	return volume;
 }
 
-void Source::seek(float, Source::Unit)
+void Source::seek(double, Source::Unit)
 {
 }
 
-float Source::tell(Source::Unit)
+double Source::tell(Source::Unit)
 {
 	return 0.0f;
 }

src/modules/audio/null/Source.h

@@ -50,8 +50,8 @@ public:
 	virtual float getPitch() const;
 	virtual void setVolume(float volume);
 	virtual float getVolume() const;
-	virtual void seek(float offset, Unit unit);
-	virtual float tell(Unit unit);
+	virtual void seek(double offset, Unit unit);
+	virtual double tell(Unit unit);
 	virtual double getDuration(Unit unit);
 	virtual void setPosition(float *v);
 	virtual void getPosition(float *v) const;