fix: model-specific instructions support and set cfg-scale 4 for breeze automatically

1 files changed, 15 insertions, 3 deletions

diff --git a/app/converter/converter.py b/app/converter/converter.py
index 3b878c8..2b849a2 100644
--- a/app/converter/converter.py
+++ b/app/converter/converter.py
@@ -137,9 +137,10 @@ def voice_mode_for(backend: str, voice: Optional[str] = None,
     sglomni resolves from the selected model's capability — a design model
     takes instructions, a clone-capable model clones when a reference .wav
     is given and otherwise synthesizes its default voice, and a
-    speaker-capable model takes a preset name; qwen designs with
-    instructions, clones only with a reference .wav, and uses a built-in
-    speaker otherwise), so the hub can run the pre-flight overwrite checks
+    speaker-capable model takes a preset name; qwen clones with a
+    reference .wav, takes a built-in speaker otherwise (instructions
+    sent as that model's delivery control), and designs with
+    instructions alone), so the hub can run the pre-flight overwrite checks
     against exactly the output names the conversion will produce.
     """
     if backend == BACKEND_FASTER:
@@ -157,6 +158,17 @@ def voice_mode_for(backend: str, voice: Optional[str] = None,
             return VOICE_MODE_CUSTOM
         # Unresolved model (the caller resolves it later): the qwen-style
         # heuristic is the closest pre-flight approximation.
+    if backend == BACKEND_QWEN:
+        # Mirrors the CLI routing (audiobook.convert): a reference clone
+        # wins, then a built-in speaker (with instructions as that
+        # model's delivery control), then instructions alone (VoiceDesign).
+        if clone:
+            return VOICE_MODE_CLONE
+        if (voice or "").strip():
+            return VOICE_MODE_CUSTOM
+        if (instructions or "").strip():
+            return VOICE_MODE_DESIGN
+        return VOICE_MODE_CUSTOM
     if (instructions or "").strip():
         return VOICE_MODE_DESIGN
     return VOICE_MODE_CLONE if clone else VOICE_MODE_CUSTOM