First commit.

src/PiPedalMath.hpp

@@ -0,0 +1,18 @@
+#pragma once 
+#include <cmath>
+
+namespace pipedal {
+
+    const double DB0=-96;
+
+    inline float db2a(float db)
+    {
+        return std::pow(10,db/20);
+    }
+    inline float a2db(float amplitude)
+    {
+        if (amplitude == 0) return DB0;
+        return 20*std::log10(std::abs(amplitude));
+    }
+
+} // namespace