diff --git a/src/sfizz/modulations/ModKey.cpp b/src/sfizz/modulations/ModKey.cpp
index bfdd198a..c5ee2a37 100644
--- a/src/sfizz/modulations/ModKey.cpp
+++ b/src/sfizz/modulations/ModKey.cpp
@@ -7,7 +7,6 @@
 #include "ModKey.h"
 #include "../Debug.h"
 #include <absl/strings/str_cat.h>
-#include <cstring>
 
 namespace sfz {
 
@@ -31,16 +30,6 @@ ModKey::Parameters& ModKey::Parameters::operator=(const Parameters& other) noexc
     return *this;
 }
 
-bool ModKey::Parameters::operator==(const Parameters& other) const noexcept
-{
-    return std::memcmp(this, &other, sizeof(*this)) == 0;
-}
-
-bool ModKey::Parameters::operator!=(const Parameters& other) const noexcept
-{
-    return std::memcmp(this, &other, sizeof(*this)) != 0;
-}
-
 ModKey ModKey::createCC(uint16_t cc, uint8_t curve, uint8_t smooth, float value, float step)
 {
     ModKey::Parameters p;
@@ -106,13 +95,3 @@ std::string ModKey::toString() const
 
 } // namespace sfz
 
-bool sfz::ModKey::operator==(const ModKey &other) const noexcept
-{
-    return id_ == other.id_ && region_ == other.region_ &&
-        parameters() == other.parameters();
-}
-
-bool sfz::ModKey::operator!=(const ModKey &other) const noexcept
-{
-    return !this->operator==(other);
-}
diff --git a/src/sfizz/modulations/ModKey.h b/src/sfizz/modulations/ModKey.h
index 96ab3705..5fff0197 100644
--- a/src/sfizz/modulations/ModKey.h
+++ b/src/sfizz/modulations/ModKey.h
@@ -9,6 +9,7 @@
 #include "ModId.h"
 #include "../NumericId.h"
 #include <string>
+#include <cstring>
 
 namespace sfz {
 
@@ -49,8 +50,15 @@ public:
         Parameters(Parameters&&) = delete;
         Parameters &operator=(Parameters&&) = delete;
 
-        bool operator==(const Parameters& other) const noexcept;
-        bool operator!=(const Parameters& other) const noexcept;
+        bool operator==(const Parameters& other) const noexcept
+        {
+            return std::memcmp(this, &other, sizeof(*this)) == 0;
+        }
+
+        bool operator!=(const Parameters& other) const noexcept
+        {
+            return std::memcmp(this, &other, sizeof(*this)) != 0;
+        }
 
         union {
             //! Parameters if this key identifies a CC source
@@ -64,8 +72,17 @@ public:
     };
 
 public:
-    bool operator==(const ModKey &other) const noexcept;
-    bool operator!=(const ModKey &other) const noexcept;
+    bool operator==(const ModKey &other) const noexcept
+    {
+        return id_ == other.id_ && region_ == other.region_ &&
+            parameters() == other.parameters();
+    }
+
+    bool operator!=(const ModKey &other) const noexcept
+    {
+        return !this->operator==(other);
+    }
+
 
 private:
     //! Identifier
diff --git a/src/sfizz/modulations/ModMatrix.cpp b/src/sfizz/modulations/ModMatrix.cpp
index 9290ba2d..643f168d 100644
--- a/src/sfizz/modulations/ModMatrix.cpp
+++ b/src/sfizz/modulations/ModMatrix.cpp
@@ -364,8 +364,7 @@ float* ModMatrix::getModulation(TargetId targetId)
                 }
                 else {
                     ASSERT(targetFlags & kModIsAdditive);
-                    for (uint32_t i = 0; i < numFrames; ++i)
-                        buffer[i] += sourceDepth * sourceBuffer[i];
+                    sfz::multiplyAdd1<float>(sourceDepth, sourceBuffer, buffer);
                 }
             }
         }