diff --git a/javascript/JZZ.js b/javascript/JZZ.js
index 7cb9cf5..296fd8d 100644
--- a/javascript/JZZ.js
+++ b/javascript/JZZ.js
@@ -2994,9 +2994,7 @@
 
   var _helpersUmp = {};
   function _copyHelperNN(name, func) {
-    UMP[name] = function() {
-      return new UMP(func.apply(this, arguments));
-    };
+    UMP[name] = function() { return new UMP(func.apply(this, arguments));};
     _helpersUmp[name] = function() { return this.send(func.apply(this, arguments)); };
   }
   function _copyHelperGC(name, func) {
@@ -3013,6 +3011,11 @@
       if (typeof this._gr != 'undefined') args = [this._gr].concat(args);
       return new UMP(func.apply(this, args));
     };
+    _helpersUmp[name] = function() {
+      var args = Array.prototype.slice.call(arguments);
+      if (typeof this._gr != 'undefined') args = [this._gr].concat(args);
+      return this.send(func.apply(this, args));
+    };
   }
   function _umpseqstat(n, i) { return n == 1 ? 0 : i == 0 ? 0x10 : i == n - 1 ? 0x30 : 0x20; }
   function _sliceSX(gr, m) {
diff --git a/test/common.js b/test/common.js
index bb897bb..7b4dd1b 100644
--- a/test/common.js
+++ b/test/common.js
@@ -1277,6 +1277,15 @@ describe('JZZ.Widget2', function() {
     port2.connect(function(msg) { sample.compare(msg); });
     port1.gr().gr(1).gr(1).gr().noop();
   });
+  it('umpBPM', function(done) {
+    var sample = new test.Sample(done, [
+      [209, 16, 0, 0, 2, 250, 240, 128, 0, 0, 0, 0, 0, 0, 0, 0],
+      [210, 16, 0, 0, 2, 250, 240, 128, 0, 0, 0, 0, 0, 0, 0, 0]
+    ]);
+    var port = JZZ.Widget2();
+    port.connect(function(msg) { sample.compare(msg); });
+    port.umpBPM(1, 120).gr(2).umpBPM(120);
+  });
 });
 
 describe('JZZ.Context', function() {