diff --git a/libs/ardour/ardour/types.h b/libs/ardour/ardour/types.h
index 1f523bc8fe..bf32e85cd0 100644
--- a/libs/ardour/ardour/types.h
+++ b/libs/ardour/ardour/types.h
@@ -192,6 +192,12 @@ namespace ARDOUR {
 		MeterCustom
 	};
 
+	enum DiskIOPoint {
+		DiskIOPreFader,  /* after the trim control, but before other processors */
+		DiskIOPostFader, /* before the main outs, after other processors */
+		DiskIOCaustom,   /* up to the user. Caveat Emptor! */
+	};
+
 	enum MeterType {
 		MeterMaxSignal = 0x0001,
 		MeterMaxPeak   = 0x0002,