Can anyone tell me how to add my own music to levels?

I know it uses files with special extentions, but how do you convert other sound files (i.e. .wav, .acd or .mp3) to .j2b files?

What programs are used to create: .669, .AM, .FAR, .MOD, .XM, .IT, .MTM, .PTM, .S3M, .STM and .ULT files?

Thanks in advace for any help,
Black S