diff --git a/go4k/go4k.go b/go4k/go4k.go
index e8f067e..b1edd4f 100644
--- a/go4k/go4k.go
+++ b/go4k/go4k.go
@@ -198,6 +198,7 @@ var UnitTypes = []UnitType{
 			{Name: "voice", MinValue: -1, MaxValue: 31, CanSet: true, CanModulate: false},
 			{Name: "unit", MinValue: 0, MaxValue: 63, CanSet: true, CanModulate: false},
 			{Name: "port", MinValue: 0, MaxValue: 7, CanSet: true, CanModulate: false},
+			{Name: "sendpop", MinValue: 0, MaxValue: 1, CanSet: true, CanModulate: false},
 		}},
 	{
 		Name:           "envelope",