diff --git a/javascript/JZZ.js b/javascript/JZZ.js
index 34d36be..0b25667 100644
--- a/javascript/JZZ.js
+++ b/javascript/JZZ.js
@@ -2721,8 +2721,9 @@
   JZZ.MIDI = MIDI;
   _J.prototype.MIDI = MIDI;
 
-  function _clear_ctxt() {
-    this._cc = {};
+  function _clear_ctxt(gr) {
+    if (typeof gr == 'undefined') this._cc = {};
+    else this._cc[gr] = {};
   }
   function _rpn_txt(msb, lsb) {
     var a = typeof msb == 'undefined' ? '??' : __hex(msb);
@@ -2839,15 +2840,15 @@
           if (s) msg.label(s);
         }
         else if (mmm[3] == 9) {
-          if (mmm[4] == 1) { msg.label('GM1 System On'); this._clear(); this._gm = '1'; }
-          else if (mmm[4] == 2) { msg.label('GM System Off'); this._clear(); this._gm = '0'; }
-          else if (mmm[4] == 3) { msg.label('GM2 System On'); this._clear(); this._gm = '2'; }
+          if (mmm[4] == 1) { msg.label('GM1 System On'); this._clear(gr); this._cc[gr].gm = '1'; }
+          else if (mmm[4] == 2) { msg.label('GM System Off'); this._clear(gr); this._cc[gr].gm = '0'; }
+          else if (mmm[4] == 3) { msg.label('GM2 System On'); this._clear(gr); this._cc[gr].gm = '2'; }
         }
       }
       else if (mmm[1] == 0x43) {
         if ((mmm[2] & 0xf0) == 0x10 && mmm[3] == 0x4c) {
           if (mmm[4] == 0 && mmm[5] == 0 && mmm[6] == 0x7e && mmm[7] == 0) {
-            msg.label('XG System On'); this._clear(); this._gm = 'Y';
+            msg.label('XG System On'); this._clear(gr); this._cc[gr].gm = 'Y';
           }
           else if (mmm[4] == 0 && mmm[5] == 0 && mmm[6] == 0) msg.label('XG Master Tuning');
           else if (mmm[4] == 0 && mmm[5] == 0 && mmm[6] == 4) msg.label('XG Master Volume');
@@ -2861,7 +2862,7 @@
           if (mmm[5] == 0x40) {
             if (mmm[6] == 0) {
               if (mmm[7] == 0x7f && mmm[8] == 0 && mmm[9] == 0x41) {
-                msg.label('GS Reset'); this._clear(); this._gm = 'R';
+                msg.label('GS Reset'); this._clear(gr); this._cc[gr].gm = 'R';
               }
               else if (mmm[7] == 0) msg.label('GS Master Tuning');
               else if (mmm[7] == 4) msg.label('GS Master Volume');
@@ -2883,6 +2884,11 @@
     self._clear = _clear_ctxt;
     self._read = _read_ctxt;
     self._receive = function(msg) { this._emit(this._read(msg)); };
+    self.gm = function(g) {
+      if (typeof g == 'undefined') g = 'x';
+      if (this._cc[g]) return this._cc[g].gm || 0;
+      return 0;
+    };
     self._clear();
     self._resume();
     return self;
diff --git a/test/common.js b/test/common.js
index 780be95..a75444c 100644
--- a/test/common.js
+++ b/test/common.js
@@ -1842,32 +1842,34 @@ describe('JZZ.Context', function() {
     var msg = JZZ.MIDI.sxGM(1);
     ctxt._receive(msg);
     assert.equal(msg.toString(), 'f0 7e 7f 09 01 f7 (GM1 System On)');
-    assert.equal(ctxt._gm, '1');
+    assert.equal(ctxt.gm(), '1');
     // MIDI 2.0
     msg = JZZ.MIDI2.sxGM(0, 1)[0];
     ctxt._receive(msg);
     assert.equal(msg.toString(), '30047e7f 09010000 -- SysEx (GM1 System On)');
+    assert.equal(ctxt.gm(0), '1');
+    assert.equal(ctxt.gm(1), '0');
   });
   it('GM2', function() {
     var ctxt = JZZ.Context();
     var msg = JZZ.MIDI.sxGM(2);
     ctxt._receive(msg);
     assert.equal(msg.toString(), 'f0 7e 7f 09 03 f7 (GM2 System On)');
-    assert.equal(ctxt._gm, '2');
+    assert.equal(ctxt.gm(), '2');
   });
   it('GM off', function() {
     var ctxt = JZZ.Context();
     var msg = JZZ.MIDI.sxGM(0);
     ctxt._receive(msg);
     assert.equal(msg.toString(), 'f0 7e 7f 09 02 f7 (GM System Off)');
-    assert.equal(ctxt._gm, '0');
+    assert.equal(ctxt.gm(), '0');
   });
   it('GS', function() {
     var ctxt = JZZ.Context();
     var msg = JZZ.MIDI.sxGS();
     ctxt._receive(msg);
     assert.equal(msg.toString(), 'f0 41 7f 42 12 40 00 7f 00 41 f7 (GS Reset)');
-    assert.equal(ctxt._gm, 'R');
+    assert.equal(ctxt.gm(), 'R');
     msg = JZZ.MIDI.sxGS(0x40, 0, 0, 0, 0x04, 0, 0);
     ctxt._receive(msg);
     assert.equal(msg.toString(), 'f0 41 7f 42 12 40 00 00 00 04 00 00 3c f7 (GS Master Tuning)');
@@ -1904,13 +1906,14 @@ describe('JZZ.Context', function() {
     assert.equal(msg[0].toString(), '3216417f 42124010 -- SysEx');
     ctxt._receive(msg[1]);
     assert.equal(msg[1].toString(), '32331500 1b000000 -- SysEx (GS Drum Part Change)');
+    assert.equal(ctxt.gm(2), '0');
   });
   it('XG', function() {
     var ctxt = JZZ.Context();
     var msg = JZZ.MIDI.sxXG();
     ctxt._receive(msg);
     assert.equal(msg.toString(), 'f0 43 10 4c 00 00 7e 00 f7 (XG System On)');
-    assert.equal(ctxt._gm, 'Y');
+    assert.equal(ctxt.gm('x'), 'Y');
     msg = JZZ.MIDI.sxXG(0, 0, 0, 0x40, 0, 0, 0);
     ctxt._receive(msg);
     assert.equal(msg.toString(), 'f0 43 10 4c 00 00 00 40 00 00 00 f7 (XG Master Tuning)');