diff --git a/frontend/src/_locales/ja/main.json b/frontend/src/_locales/ja/main.json
index 0302694..feeaf49 100644
--- a/frontend/src/_locales/ja/main.json
+++ b/frontend/src/_locales/ja/main.json
@@ -295,5 +295,10 @@
   "Sax": "サックス",
   "Flute": "フルート",
   "Lead": "リード",
-  "Pad": "パッド"
+  "Pad": "パッド",
+  "MIDI Input": "MIDI入力",
+  "Select the MIDI input device to be used.": "使用するMIDI入力デバイスを選択します。",
+  "Start Time": "開始時間",
+  "Content Duration": "内容の長さ",
+  "Please select a MIDI device first": "まずMIDIデバイスを選択してください"
 }
\ No newline at end of file
diff --git a/frontend/src/_locales/zh-hans/main.json b/frontend/src/_locales/zh-hans/main.json
index 3d3d895..00d441b 100644
--- a/frontend/src/_locales/zh-hans/main.json
+++ b/frontend/src/_locales/zh-hans/main.json
@@ -295,5 +295,10 @@
   "Sax": "萨克斯",
   "Flute": "长笛",
   "Lead": "主音",
-  "Pad": "和音"
+  "Pad": "和音",
+  "MIDI Input": "MIDI输入",
+  "Select the MIDI input device to be used.": "选择要使用的MIDI输入设备",
+  "Start Time": "开始时间",
+  "Content Duration": "内容时长",
+  "Please select a MIDI device first": "请先选择一个MIDI设备"
 }
\ No newline at end of file
diff --git a/frontend/src/pages/AudiotrackManager/AudiotrackEditor.tsx b/frontend/src/pages/AudiotrackManager/AudiotrackEditor.tsx
index 09f672c..1de65ef 100644
--- a/frontend/src/pages/AudiotrackManager/AudiotrackEditor.tsx
+++ b/frontend/src/pages/AudiotrackManager/AudiotrackEditor.tsx
@@ -365,6 +365,11 @@ const AudiotrackEditor: FC<{ setPrompt: (prompt: string) => void }> = observer((
                   if (commonStore.recordingTrackId === track.id) {
                     commonStore.setRecordingTrackId('');
                   } else {
+                    if (commonStore.activeMidiDeviceIndex === -1) {
+                      toast(t('Please select a MIDI device first'), { type: 'warning' });
+                      return;
+                    }
+
                     dropRecordingTime = true;
                     setSelectedTrackId(track.id);
 
@@ -393,6 +398,7 @@ const AudiotrackEditor: FC<{ setPrompt: (prompt: string) => void }> = observer((
                 appearance="subtle" onClick={() => {
                 const tracks = commonStore.tracks.slice().filter(t => t.id !== track.id);
                 commonStore.setTracks(tracks);
+                refreshTracksTotalTime();
               }} />
             </div>
             <div className="relative grow overflow-hidden">
@@ -431,7 +437,7 @@ const AudiotrackEditor: FC<{ setPrompt: (prompt: string) => void }> = observer((
         <Card size="small" appearance="outline" style={{ minHeight: '150px', maxHeight: '200px' }}>
           <div className="flex flex-col gap-1 overflow-hidden">
             <Text size={100}>{`${t('Start Time')}: ${selectedTrack.offsetTime} ms`}</Text>
-            <Text size={100}>{`${t('Content Time')}: ${selectedTrack.contentTime} ms`}</Text>
+            <Text size={100}>{`${t('Content Duration')}: ${selectedTrack.contentTime} ms`}</Text>
             <div className="overflow-y-auto overflow-x-hidden" ref={contentPreviewRef}>
               {selectedTrackId === commonStore.recordingTrackId
                 ? commonStore.recordingContent
diff --git a/frontend/src/utils/index.tsx b/frontend/src/utils/index.tsx
index 1d875c6..1408cc7 100644
--- a/frontend/src/utils/index.tsx
+++ b/frontend/src/utils/index.tsx
@@ -482,6 +482,12 @@ export function getHfDownloadUrl(url: string) {
 }
 
 export function refreshTracksTotalTime() {
+  if (commonStore.tracks.length === 0) {
+    commonStore.setTrackTotalTime(tracksMinimalTotalTime);
+    commonStore.setTrackCurrentTime(0);
+    commonStore.setTrackPlayStartTime(0);
+    return;
+  }
   const endTimes = commonStore.tracks.map(t => t.offsetTime + t.contentTime);
   const totalTime = Math.max(...endTimes) + tracksMinimalTotalTime;
   if (commonStore.trackPlayStartTime > totalTime)