[Python] Mix multiple songs in python, create new song from these and share the loyalty to the...

I have a project built in Next.js (frontend and backend) where multiple artists can upload their sample packs, individual samples, and stems (inside samples). Now I want to implement a feature where:

1. 
   Multiple samples or stems can be mixed to generate a new sample/stem
   
   
2. 
   The system should automatically detect the percentage contribution of each original sample/stem used in the final mix
   
   
3. 
   Then notify the respective artists about their usage
   
   
4. 
   Based on the usage percentage, the artist should also receive a matching percentage of revenue/earnings
   

I’ve already learned Python basics, so now I want to know:

1. 
   Should I build my own solution or model from scratch for this?
   
   
2. 
   Or should I use existing libraries or pre-trained models?
   
   
3. 
   If using libraries, which ones would be effective for this use case?
   
   
4. 
   And if I decide to build my own model, what tools, concepts, or machine learning What techniques should I learn?
   

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