Extracted staffVolumeUp to seperate file

src/main.cpp

@@ -3,6 +3,7 @@
 #include <potControlls.h>
 #include <ledControlls.h>
 #include <userFunctions.h>
+#include <staffFunctions.h>
 
 int maxVolume = 64;
 int userVolume = 64;
@@ -48,10 +49,7 @@ void loop()
   // SW1 - Staff Volume Up
   if (!debounceRead(BTN_STAFF_UP))
   {
-    if (maxVolume < 100)
-    {
-      maxVolume += STAFF_STEPS;
-    }
+    staffVolumeUp(&maxVolume);
   }
 
   // SW2 - Staff Volume Down

src/staffFunctions.cpp

@@ -0,0 +1,10 @@
+#include <staffFunctions.h>
+#include <constants.h>
+
+void staffVolumeUp(int *maxVolume)
+{
+    if (*maxVolume < 64)
+    {
+        *maxVolume += STAFF_STEPS;
+    }
+}