diff --git a/japji/index.html b/japji/index.html
index 3c1250a..383f6f0 100644
--- a/japji/index.html
+++ b/japji/index.html
@@ -1723,7 +1723,7 @@
 
       (def student-recordings (atom (apply vector (repeat (count data) nil))))
 
-      (defn enable-play-button [phrase-no])
+      (defn enable-play-button! [phrase-no])
 
       (defn record-student-sound!
         [phrase-no]
@@ -1732,10 +1732,10 @@
         (try
           (.then (.getUserMedia (.mediaDevices js/navigator) {:audio true})
             (fn [arg] 
-              (let [media-recorder (MediaRecorder. arg)
+              (let [media-recorder (js/MediaRecorder. arg)
                     audio-chunks (atom [])]
                   (.start media-recorder)
-                  (set! media-recorder onerror 
+                  (set! (.-onerror media-recorder)  
                     (fn [s] 
                       (.log js/console (str "Error while recording sound: " s))))
                   (.addEventListener media-recorder "dataavailable" 
@@ -1747,7 +1747,7 @@
                       (js/console.log "data available after MediaRecorder.stop() called.")
                       (if (> (count @audio-chunks) 0)
                         (do
-                          ;; Store the blob in the student-sounds data structure
+                          ;; Store the blob in the student-recordings data structure
                           (swap! student-recordings assoc phrase-no
                             (js/Blob. (clj->js @audio-chunks)))
                           (enable-play-button! phrase-no))))))))
@@ -1801,7 +1801,7 @@
 
       (defn play-student! 
         [phrase-no]
-        (.play (js/Audio. (.createObjectURL js/URL (@student-sounds phrase-no)))))
+        (.play (js/Audio. (.createObjectURL js/URL (@student-recordings phrase-no)))))
 
       (defn animate-progress-bar!
         [id duration]