diff --git a/synth_dexed.h b/synth_dexed.h
index 3a19634..cb35296 100644
--- a/synth_dexed.h
+++ b/synth_dexed.h
@@ -1015,6 +1015,15 @@ enum ADSR {
   RELEASE
 };
 
+enum OPERATORS {
+	OP1,
+	OP2,
+	OP3,
+	OP4,
+	OP5,
+	OP6
+};
+
 /* #define DEXED_GLOBAL_PARAMETER_OFFSET 155
   enum DexedGlobalParameters {
   DEXED_PITCHBEND_RANGE,    // 0