Extracted volumeDown to seperate file

include/constants.h

@@ -0,0 +1,19 @@
+#pragma once
+
+const int USER_STEPS = 2;
+const int STAFF_STEPS = 16;
+
+const int POT_CS = 10;
+const int POT_UD = 9;
+
+const int LED_HIGH  = 11;   // Green
+const int LED_MED   = 12;   // Red
+const int LED_LOW   = 13;   // Green
+
+const int BTN_STAFF_UP  = 2;
+const int BTN_STAFF_DWN = 4;
+
+const int REMOTE_A = 17;
+const int REMOTE_B = 16;
+const int REMOTE_C = 15;
+const int REMOTE_D = 14;