Mac os x file system creates one hidden file: ._filename for each actual file, which is a link to the real file. if you copied the whole folder from Mac to SD card, the you would have copied these hidden links as well. the dap would read this file and then play it, giving the impression that each file is played twice.either select and copy files (not folders) from Mac to SD cardorshow hidden files on the SD card and delete all files with pattern ._*
I don't have an X5, but I've had something similar happen to me with duplicate files on a Rockboxed Clip+. Did you use a Mac to copy an entire folder of flac/wav files from a OS X file volume onto the micro SD card? Mac OS X creates a bunch of ._filename hidden file for each actual file, and some systems like Rockbox will interpret the ._filename file as the actual file, and depending on the database/file browser, it may show 2 copies of the same song.
Actually if you have the JDS labs o2+odac combo, when the o2 amp power is off, the line in jack functions as the line out of the odac, so you can connect it to another amp.When the o2 power is on, the line in jack functions as the line in for the o2 amp, and you can actually send signals to the o2 at the same time from both odac and line in.
sony does offer a cradle for the ZX1 http://www.sony.jp/walkman/products/STD-NWU10/ it says:- works with bundled USB cable or separate USB cable WMC-NW20MU- works with ZX1 in the case, or with headphone plugged in- USB can be connected to PC or AC adapter, for data and charging http://www.sony.jp/walkman/products/STD-NWU10/feature_1.html#L1_30 so it seems like you can combine the cradle with this other cable http://www.sony.jp/walkman/products/WMC-NWH10/ to send line out...
From their official site, the box includes: carrying pouch, spacer (?), USB cable, WM-Port cap, user manual http://www.sony.jp/walkman/products/NW-ZX1/spec.html and they only offer official screen protectors to purchase, but i'm sure you'll find after market cases once it's out.. http://www.sony.jp/walkman/products/NW-ZX1/compatible.html
i've used my LD I+ with the following and it works well with my Grado 225i's
Sylvania Gold Brand 408A - These are harder to find and usually cost more than WE 408A
Western Electric 408A
Remember to change the jumpers for 408A type tubes if you switch from stock! It's been a few years since I had OPA2107 and GB 408A combination, so I won't be able to give any comparisons to the stock tubes...