Add speech enhancement as a pipeline step in the voice editor

Real reference clips are often cheap-mic/phone-call quality. Adds
AuK's dedicated Speech Enhancement task (denoise+dereverb, or a
telephone-effect-specific variant) as a new dropdown, applied first
in the edit chain - before emotion/pitch/speed/custom - since character
edits on noisy source audio just carry the noise through.

Found useful while iterating on real character voices for a sibling
project (the-service-station) using this exact tool.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Y1oQ4h4WE4R9KRvMQLr5Ey

webui/app.py

@@ -151,11 +151,35 @@ def _history_label(history: list) -> str:
     return f"Edit history: {len(history) - 1} edit(s) applied on top of the original reference."
 
 
-def apply_edit(current_ref: str, history: list, emotion: str, pitch: str, speed: str, custom_instruction: str):
+ENHANCE_INSTRUCTIONS = {
+    "none": None,
+    "General (denoise + dereverb)": (
+        "Preserve all speakers, remove noise and reverberation, and output "
+        "clean speech of the same length."
+    ),
+    "Telephone/call recording": (
+        "Repair the telephone effect and restore natural, clear speech."
+    ),
+}
+
+
+def apply_edit(
+    current_ref: str,
+    history: list,
+    enhance: str,
+    emotion: str,
+    pitch: str,
+    speed: str,
+    custom_instruction: str,
+):
     if not current_ref:
         raise gr.Error("Set a voice reference first (upload, strip with Demucs, or use a previous edit).")
 
     instructions = []
+    # Enhancement goes first when picked - clean the recording up before any
+    # character/accent editing, not after (garbage in, garbage timbre-edited).
+    if enhance and ENHANCE_INSTRUCTIONS.get(enhance):
+        instructions.append(ENHANCE_INSTRUCTIONS[enhance])
     if emotion and emotion != "none":
         instructions.append(f"Change the emotion to {emotion}.")
     if pitch and pitch != "none":
@@ -167,7 +191,7 @@ def apply_edit(current_ref: str, history: list, emotion: str, pitch: str, speed:
         instructions.append(custom_instruction.strip())
 
     if not instructions:
-        raise gr.Error("Pick at least one edit (emotion / pitch / speed / custom instruction).")
+        raise gr.Error("Pick at least one edit (enhance / emotion / pitch / speed / custom instruction).")
 
     _free_comfyui_memory()
     ref = current_ref
@@ -270,6 +294,10 @@ with gr.Blocks(title="Audio-demo pipeline studio") as demo:
             gr.Markdown("## 2. Voice editor (AuK)")
             current_ref_audio = gr.Audio(label="Current reference", type="filepath", interactive=False)
             history_label = gr.Markdown("No reference set yet.")
+            enhance_dd = gr.Dropdown(
+                list(ENHANCE_INSTRUCTIONS.keys()), value="none",
+                label="Enhance (denoise/dereverb/restore) - runs first, before character edits",
+            )
             emotion_dd = gr.Dropdown(["none"] + EMOTIONS, value="none", label="Emotion")
             pitch_dd = gr.Dropdown(["none"] + PITCH_OPTIONS, value="none", label="Pitch (semitones)")
             speed_dd = gr.Dropdown(["none"] + SPEED_OPTIONS, value="none", label="Speed")
@@ -309,7 +337,7 @@ with gr.Blocks(title="Audio-demo pipeline studio") as demo:
     )
     apply_btn.click(
         apply_edit,
-        inputs=[current_ref_audio, history_state, emotion_dd, pitch_dd, speed_dd, custom_instruction],
+        inputs=[current_ref_audio, history_state, enhance_dd, emotion_dd, pitch_dd, speed_dd, custom_instruction],
         outputs=[current_ref_audio, history_state, history_label],
     )
     undo_btn.click(