Cover re-renders an existing song in a new style while keeping its structure recognizable, on the full-size ACE-Step 1.5 checkpoint. Pick a source, describe the target sound (genre, instruments, vocal character, production), and set Cover strength: high values stay faithful to the arrangement, 0.5 to 0.6 transforms the genre while the hook survives, 0.2 only borrows the mood. Add a reference track to guide the feel, pass lyrics to keep or rewrite the words, or toggle Instrumental. For quick tests at half the cost, use ACE-Step 1.5 Cover Turbo.