diff --git a/web/app/assets/javascripts/playbackControls.js b/web/app/assets/javascripts/playbackControls.js
index fb82ab0c6..2aeaf0632 100644
--- a/web/app/assets/javascripts/playbackControls.js
+++ b/web/app/assets/javascripts/playbackControls.js
@@ -54,6 +54,13 @@
         var monitorPlaybackTimeout = null;
         var playbackMonitorMode = PLAYBACK_MONITOR_MODE.MEDIA_FILE;
 
+        function init() {
+          updateSliderPosition(0);
+          updateDurationTime(0);
+          updateCurrentTime(0);
+          seenActivity = false;
+        }
+
         function startPlay() {
             seenActivity = false;
             updateIsPlaying(true);
@@ -349,6 +356,9 @@
 
         function startMonitor(_playbackMonitorMode) {
 
+            // resets everything to zero
+            init();
+
             if(_playbackMonitorMode === undefined || _playbackMonitorMode === null) {
               playbackMonitorMode = PLAYBACK_MONITOR_MODE.MEDIA_FILE;
             }
diff --git a/web/app/assets/javascripts/session.js b/web/app/assets/javascripts/session.js
index d7246dd5d..6bb576dbf 100644
--- a/web/app/assets/javascripts/session.js
+++ b/web/app/assets/javascripts/session.js
@@ -1273,9 +1273,10 @@
           });
         }
 
-        function renderJamTracks(jamTrackMixers) {
+        function renderJamTracks(jamTrackMixersOrig) {
           logger.debug("rendering jam tracks")
 
+          var jamTrackMixers = jamTrackMixersOrig.slice();
           var jamTracks = []
           var jamTrackName = 'JamTrack';
           if(sessionModel.isPlayingRecording()) {
@@ -1305,7 +1306,7 @@
               var preMasteredClass = "";
               // find the track or tracks that correspond to the mixer
               var correspondingTracks = []
-              $.each(jamTrackMixers, function(i, matchMixer) {
+              $.each(jamTrackMixersOrig, function(i, matchMixer) {
                   if(matchMixer.id == jamTrack.id) {
                     correspondingTracks.push(jamTrack);
                     mixer = matchMixer;
@@ -1327,6 +1328,9 @@
                 return $.inArray(value, correspondingTracks) < 0;
               });
 
+              // prune found mixers
+              jamTrackMixers.splice(mixer);
+
               var oneOfTheTracks = correspondingTracks[0];
               var instrumentIcon = context.JK.getInstrumentIcon45(oneOfTheTracks.instrument.id);
               var photoUrl = "/assets/content/icon_recording.png";