I do not take credit for this but to answer folks questions about Rockbox, this is what I came up with during my research and getting in contact with a very helpful head-fier on this site:
"By converting your iMod into a Rockbox player, this extends the codec supports and in particular gives you the possibility to use Flac files. The extra bonus is the decent EQ on Rockbox, which puts the stock Apple one to shame. Plus you don't have to convert everything to ALAC

Much less hassle IMO.
When I don't have FLAC files I convert using dbpoweramp. The main point is it gives me the flexibility to use different files. But I prefer FLAC if I can.
Skoog