examples/ofx/Bitalino_rapidmix/src/SigTools.cpp

+//
+//  SigTools.cpp
+//  
+//
+//  Created by James on 08/01/17.
+//
+//
+
+#include "SigTools.hpp"
+
+double MTOF ( unsigned char midi ) {
+    return pow( 2, static_cast< double >( midi-69 ) / 12.0 ) * 440.0;
+}
+
+double FTOM ( double freq ) {
+    return 12.0 * log2( freq / 440.0 ) + 69;
+}

examples/ofx/Bitalino_rapidmix/src/SigTools.hpp

+//
+//  SigTools.hpp
+//  
+//
+//  Created by James on 08/01/17.
+//
+//
+
+#ifndef SigTools_hpp
+#define SigTools_hpp
+
+#include <stdio.h>
+#include <math.h>
+
+double MTOF ( unsigned char midi );
+double FTOM ( double freq );
+
+#endif /* SigTools_hpp */