After a bit of reversing OF and reading service manual, I'm proud to announce that earlier in second half of November, Rockbox played music on the Philips GoGear HDD1630 for the first time!
And the song was "The Blend (Feat. What What)" by "The Herbaliser" from "1997 - Blow Your Headphones" album, and it was encoded in flac! And thanks to Mark Arigo (lowlight) for the first commit for this model and for reviewing my patches. Keep on Rocking! by Anton