For the car adapter, something like this will do
For the SDHC card, try formatting it to its default file system.
Yes, all you should need to do is fully rotate the stepped attenuator about 20-50 times and you should be good. There will be clicks/crackles between steps, this is the nature of the attenuator. Second, the clicks you're hearing when changing tracks is normal, as the DACs are switching clocks and stuff.
Yeah, the invertor is the solution. Thanks for the tip.
I felt in love with this player-iems-cable. Just listened to a Telarc SACD. Unbeliaveble for such a small gadget.
I will re-format SDcard, Good idea.