feat: added mixer component and add wet/dry mix to distortion

core/Mixer.hpp

@@ -0,0 +1,29 @@
+#ifndef MIXER_HPP_INCLUDED
+#define MIXER_HPP_INCLUDED
+
+#include <cstdint>
+
+template <uint32_t NumInputs> class Mixer {
+public:
+  Mixer(float init_gain);
+
+  void process(const float **inputs, float *out, uint32_t frames);
+  void processStereo(const float **inputsL, const float **inputsR, float *outL,
+                     float *outR, uint32_t frames);
+
+  void setInputGain(uint32_t index, float gain);
+  float getInputGain(uint32_t index) const;
+
+  void setNormalise(bool norm);
+  bool getNormalise() const;
+
+private:
+  void mixChannels(const float **inputs, float *out, uint32_t frames);
+  bool isValidInputIndex(float index) const;
+  float gains_[NumInputs];
+  bool normalise_;
+};
+
+#endif // MIXER_HPP_INCLUDED
+
+template class Mixer<2u>;