You need 2 expands:
- Expand #1: 128 lines @ 4 LPB → 256 lines @ 8 LPB
- Expand #2: 256 lines @ 8 LPB → 512 lines @ 16 LPB
But… yeah, Jonas has a very good point. There’s already an existing tool designed for this job that I had simply forgotten about. Might be a good idea to give that a try first.
You can find it here further down in the thread that Jonas linked to: Snippet: Convert Song From Lpb4 To Lpb12
Download the .XRNX to your desktop or something, and then drag the .XRNX file into Renoise to install it. The tool will then be available to use from the Tools main menu.
Seems like these concepts are new to him (as they are to many other users at first), so let’s give him a break please? Just trying to be helpful here. 