diff --git a/server/api/studio-queue/[id].patch.ts b/server/api/studio-queue/[id].patch.ts
index d28534d..198e709 100644
--- a/server/api/studio-queue/[id].patch.ts
+++ b/server/api/studio-queue/[id].patch.ts
@@ -52,7 +52,12 @@ export default defineEventHandler(async (event) => {
     }
     if (body.lyrics != null) payload.lyrics = text(body.lyrics)
     const instrumental = optionalBool(body.instrumental)
-    if (instrumental != null) payload.instrumental = instrumental
+    if (instrumental != null && row.kind === 'music') {
+      if (instrumental) throw createError({ statusCode: 400, statusMessage: 'YuE2 requires lyrics. Instrumental mode is not supported.' })
+      payload.instrumental = false
+    } else if (instrumental != null) {
+      payload.instrumental = instrumental
+    }
     if (body.promptPre != null) payload.promptPre = text(body.promptPre)
     if (body.promptMid != null) payload.promptMid = text(body.promptMid)
     if (body.promptPost != null) payload.promptPost = text(body.promptPost)
@@ -62,6 +67,7 @@ export default defineEventHandler(async (event) => {
       if (row.kind === 'music') {
         if (!Number.isInteger(duration) || duration < 30 || duration > 150) throw createError({ statusCode: 400, statusMessage: 'YuE2 duration must be 30–150 seconds.' })
         payload.duration = duration
+        payload.musicEngine = 'yue2'
       } else payload.duration = Math.min(120, Math.max(0.5, duration))
     }
     const steps = optionalNumber(body.steps)