Merge pull request #337 from jpcima/get-voice-non-const

Voice accessor without const qualifier

src/sfizz/Synth.h

@@ -210,6 +210,17 @@ public:
      * @return const Voice*
      */
     const Voice* getVoiceById(NumericId<Voice> id) const noexcept;
+    /**
+     * @brief Find the voice which is associated with the given identifier.
+     *
+     * @param id
+     * @return Voice*
+     */
+    Voice* getVoiceById(NumericId<Voice> id) noexcept
+    {
+        return const_cast<Voice*>(
+            const_cast<const Synth*>(this)->getVoiceById(id));
+    }
     /**
      * @brief Get a raw view into a specific region. This is mostly used
      * for testing.