graph TD
A[Start: Receive downloaded-mp3-urls] --> B[Initialize AudioSeparator]
B --> C[Process First MP3]
B --> D[Process Second MP3]
B --> E[Process Third MP3]
C --> F[Extract Stems - Skill #197]
D --> G[Extract Stems - Skill #197]
E --> H[Extract Stems - Skill #197]
F --> I[vocal1.mp3]
F --> J[instrumental1.mp3]
G --> K[vocal2.mp3]
G --> L[instrumental2.mp3]
H --> M[vocal3.mp3]
H --> N[instrumental3.mp3]
I --> O[Collate & Map - Skill #223]
J --> O
K --> O
L --> O
M --> O
N --> O
O --> P[Structure Final Output]
P --> Q[Return vocals-instrumentals-urls]