Testing a fix for broken tempo slider

app.py

@@ -321,6 +321,28 @@ if filetype == "MEI":
     st.header("2. Edit Phonemes, Durations, and Pitches")
     updated_syllables = []
 
+if "previous_tempo" not in st.session_state:
+    st.session_state.previous_tempo = tempo
+
+if tempo != st.session_state.previous_tempo:
+    for i, note in enumerate(st.session_state.original_raw_notes):
+        updated = split_syllable(
+            syllable=note["lyric"],
+            note_duration=note["duration"],
+            tempo=tempo,
+            pitch=note["pitch"]
+        )
+        # preserve existing phoneme values (if possible)
+        for j, ph in enumerate(updated):
+            try:
+                existing = st.session_state.edited_syllables[i]["phonemes"][j]
+                ph["phoneme"] = existing["phoneme"]
+                ph["pitch"] = existing["pitch"]
+            except IndexError:
+                pass  # new phoneme or longer split
+        st.session_state.edited_syllables[i]["phonemes"] = updated
+    st.session_state.previous_tempo = tempo
+
     for idx, group in enumerate(st.session_state.edited_syllables):
         st.markdown(f"#### {group['syllable'].capitalize()}")
         new_phonemes = []