Hey jaminjimlp, mac has 'Automator' (in the applications folder) that can do the bulk renaming task. This is what my workflow looked like for the last renaming I did:



I have the workflow saved for anyone who might want it but it is pretty easy to make from scratch.

Also, when I renamed the Ownhammer V3 IRs I used a PC and read everything in from a spreadsheet (that way numbers could 'jump' and didn't have to be in sequential order), I don't remember exactly how I did it but it wasn't too hard to find with google. (I also have EPSi-numbered spreadsheets for the Ownhammer studio vintage and modern 412 packs as well as the 212 multi-speaker pack if anyone wants them.)