It's been a while since I did this and it looks like things have changed. The main sticky'd thread is years long, and my I remember the aback and forth on trying to find how to do this. I recall there even being a comment that it caused a re-write of some documented instructions.
Now that I see that thread has an update:
JUNE 11, 2019
THINGS HAVE CHANGED AND ARE BETTER! CHECK OUT THE FOLLOWING LINK FOR UPDATED INSTRUCTIONS:
When it comes to converting files for PS3, it simply says:
There are detailed instructions on this very forum on how to use the great C3 CON TOOLS to convert xbox customs to PS3, so I won't go into the details here, but it's super-easy!
The only things I recommend is to choose encryption Type 3 and to check that you have selected the correct NTSC/PAL format.
I haven't found any obvious thread on this forum on how to do this. I downloaded a bunch of songs from the customs database and I'd like to migrate them to my already modded PS3. If I have to convert the files with the C3 CON TOOLS software that I have, is there a simple set of instructions anywhere?