There have not been much response....
Discovered pretty fast that help is not easy to get when Linux and MPD is involved.
So to solve the issues I had to use time I did no have and learn the bits and pieces myself.
Then I discovered that the "specialists" was not as clever as they thought them selves..
Anyway - I have ended up with a ARM based system (at the time beeing a CuBox) and have compiled kernels, MPD and built the debian wheezy base filesystem with debootstrap.
Both the 3.5.2 kernels and MPD 0.18git is tweaked to suit my needs and my ideas of how they should perform and work.
By tweaking I have patched, edited scripts and edited source code to be able to get it right.
The kernel is compiled with everything inside (that I need) and thus there is no external modules.
Due to I have Mac OSX, Windows and Linux systems I have compiled in support for all the filesystems and partition variants I have as both USB 2.0 and SATA / eSATA storage devices can be connected.
The kernel is a PREEMPT with threadirqs and RT priorities on USB 2.0 Audio adapters, MPD etc..
As the ALSA drivers is compiled into the kernel I have optimized the NRPACKS and other settings in the source code / kernel, and as I have removed all debugging and other functions /proc contains only the most basic informations like the ID of the soundcards. And as the base filesystem is as simple as possible there is not installed commands like lsusb or lspci etc..
There is no graphic support as that is also removed from the kernel - so it is a completely headless system.
MPoD / MPaD auto-discovers MPD and local cover art works and can be configured without knowing IP addresses etc..
Only WAV, AIFF, FLAC and DSD (native or converted to PCM) formats is supported.
Playing 44.1k/16bit on the internal SPDIF and two USB Audio 2.0 adapters simultaneously uses only ca. 1% of the 800MHz ARM CPU.
My i5 supertweaked system with 3.2.x RT kernel and stock MPD 0.17.1 are now "retired" and have become a totally quiet and very fast crosscompiler