Add global volume and reverb control.

Author: Archie3d

README.md

@@ -23,3 +23,6 @@ The convolution reverb uses IRs from the [Open AIR](https://www.openair.hosted.y
 
 ## MIDI Control
 Sequencer steps are controlled via the program change messages sent on the control MIDI channel (program 0 corresponds to the first step of the sequencer, 1 - to the second and so on).
+
+- `CC 7` on control channel controls the global volume;
+- `CC 91` on control channel controls the reverb output level;

Source/aeolus/engine.cpp

@@ -616,6 +616,20 @@ void Engine::processControlMIDIMessage(const MidiMessage& message)
 
         if (step >= 0 && step < _sequencer->getStepsCount())
             _sequencer->setStep(step);
+    } else if (message.isController()) {
+        int cc = message.getControllerNumber();
+        const float value = float(message.getControllerValue()) / 127.0f;
+
+        switch (cc) {
+        case CC_VOLUME:
+            setVolume(value);
+            break;
+        case CC_REVERB:
+            setReverbWet(value);
+            break;
+        default:
+            break;
+        }
     }
 }
 

Source/aeolus/engine.h

@@ -123,6 +123,11 @@ class Engine
         NUM_PARAMS
     };
 
+    enum {
+        CC_VOLUME = 7,
+        CC_REVERB = 91
+    };
+
     //--------------------------------------------------------------------------
 
     Engine();
@@ -161,6 +166,9 @@ class Engine
      */
     int getReverbIR() const noexcept { return _selectedIR; }
 
+    /**
+     * Returns the reverb tail in seconds.
+     */
     float getReverbLengthInSeconds() const;
 
     /**