added generic voice allocator

synth/note_event.h

@@ -0,0 +1,25 @@
+#pragma once
+
+namespace trnr::lib::synth {
+
+enum note_event_type {
+    note_on = 0,
+    note_off
+};
+
+class note_event {
+public:
+    note_event_type type;
+    int midi_note;
+    float velocity;
+    int offset;
+
+    note_event(note_event_type type, int _midi_note, float _velocity, int _offset)
+        : type { type }
+        , midi_note { _midi_note }
+        , velocity { _velocity }
+        , offset { _offset }
+    {
+    }
+};
+}