Great, thanks for the info about preamp, I just did not thought about it.
Service manual is the same for models HDD1420/00 HDD1620/00/05 HDD1630 HDD1635/17
14xx is 4Gb models, 16xx is 6Gb models, "xx" digits and digits after slash is for different regions I guess.
And 63xx have the same hardware except touchpad, different PCB and HDD (30Gb) bigger form-factor and capacity.
I have not tested it on 6330, because I have not this model, but as hardware is the same, it should work.
Yea touchpad is different, I don't know is it worth to add new model because of touchpad or not.
We can just add another keymap in the future?
Wiki say that 6330 have RTC.http://www.rockbox.org/twiki/bin/view/Main/GoGearHDD6330
I will continue reversing OF for preamp and touchpad.
PS going to subscribe for rockbox-dev